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  • 1.
    Gong, Shaofang
    et al.
    Linköping University, Department of Science and Technology, Physics and Electronics. Linköping University, The Institute of Technology.
    Huynh, Allan
    Linköping University, Department of Science and Technology, Physics and Electronics. Linköping University, The Institute of Technology.
    Karlsson, Magnus
    Linköping University, Department of Science and Technology, Physics and Electronics. Linköping University, The Institute of Technology.
    Serban, Adriana
    Linköping University, Department of Science and Technology, Physics and Electronics. Linköping University, The Institute of Technology.
    Owais, Owais
    Linköping University, Department of Science and Technology, Physics and Electronics. Linköping University, The Institute of Technology.
    Östh, Joakim
    Linköping University, Department of Science and Technology, Physics and Electronics. Linköping University, The Institute of Technology.
    Truly Differential RF and Microwave Front-End Design2010In: IEEE 11th Annual Wireless and Microwave Technology Conference (WAMICON), Piscataway, NJ, USA: IEEE , 2010, p. 1-5Conference paper (Refereed)
    Abstract [en]

    New design methodology for truly differential RF and microwave front-ends has been presented in this paper. Baluns are avoided using this design methodology, while achieving differential signaling for high noise immunity. A case study on an ultra-wide band RF front-end in the frequency band 6-9 GHz has been performed using the new design methodology, indicating that both wide bandwidth and high performance can be achieved using this design methodology. A direct comparison between single-ended and differential designs of the RF filter has also been presented in order to verify the correctness of the design methodology.

  • 2.
    Gong, Shaofang
    et al.
    Linköping University, Department of Science and Technology. Linköping University, The Institute of Technology.
    Karlsson, Magnus
    Linköping University, Department of Science and Technology. Linköping University, The Institute of Technology.
    Serban, Adriana
    Linköping University, Department of Science and Technology. Linköping University, The Institute of Technology.
    Östh, Joakim
    Linköping University, Department of Science and Technology. Linköping University, The Institute of Technology.
    Owais, Owais
    Linköping University, Department of Science and Technology. Linköping University, The Institute of Technology.
    Haartsen, Jaap
    Sony Ericsson Mobile Communications AB, Lund, Sweden.
    Karlsson, Peter
    Sony Ericsson Mobile Communications AB, Lund, Sweden.
    Radio Architecture for Parallel Processing of Extremely High Speed Data2009In: IEEE International Conference on Ultra-Wideband, ICUWB, Vancouver, Canada, 9-11 Sept., IEEE , 2009, p. 433-437Conference paper (Refereed)
    Abstract [en]

    Using our own-developed frequency multiplexing network, a radio architecture for parallel radio signal processing has been proposed for achieving extremely high data rate above 10 Gbit/s. To meet the high requirement on phase linearity, amplitude balance and low noise figure in a very large bandwidth, our own-developed ultra-wideband six-port correlator has been utilized for the modulator and demodulator in the radio architecture.

  • 3.
    Gong, Shaofang
    et al.
    Linköping University, The Institute of Technology. Linköping University, Department of Science and Technology.
    Karlsson, Magnus
    Linköping University, The Institute of Technology. Linköping University, Department of Science and Technology.
    Serban Craciunescu, Adriana
    Linköping University, The Institute of Technology. Linköping University, Department of Science and Technology.
    Design of a radio front-end module at 5 GHz2004In: 6th Circuits and System Symposium on Emerging Technologies: Frontiers of Mobile and Wireless Communication,2004, Piscataway, CA, USA: IEEE , 2004, p. 241-Conference paper (Refereed)
  • 4.
    Gong, Shaofang
    et al.
    Linköping University, Department of Science and Technology, Physics and Electronics. Linköping University, Faculty of Science & Engineering.
    Östh, Joakim
    Serban, Adriana
    Linköping University, Department of Science and Technology, Physics and Electronics. Linköping University, Faculty of Science & Engineering.
    Karlsson, Magnus
    Linköping University, Department of Science and Technology, Physics and Electronics. Linköping University, Faculty of Science & Engineering.
    Six-port Modulators for High Speed Data2016In: GigaHertz Symposium 2016, Linköping, 2016, p. 65-Conference paper (Refereed)
    Abstract [en]

    Results from our recent study on six-port modulators and demodulators for high speed data transmission have shown that the six-port radio technology has the potential to catch up the speed of the Internet. This is due to the fact that the binary baseband data, either electrical or optical, can be converted directly to high order modulated RF signal without any D/A conversion. The six-port modulators and demodulators can also be designed with differential circuitry to improve the signal-to-noise ration and dynamic range. In addition, antennae and radio front-end components can be integrated on the same substrate with the six-port modulator and demodulator.

  • 5. Jakobsson, Anders
    et al.
    Grewing, Christian
    Gong, Shaofang
    Linköping University, Department of Science and Technology, Physics and Electronics. Linköping University, The Institute of Technology.
    Serban, Adriana
    Linköping University, Department of Science and Technology, Physics and Electronics. Linköping University, The Institute of Technology.
    Dual Loop Gain Calibration of Frequency Synthesizer2013Conference paper (Refereed)
  • 6.
    Jakobsson, Anders
    et al.
    Huawei Technologies Sweden, Kista, Sweden .
    Grewing, Christian
    Huawei Technologies Sweden, Kista, Sweden .
    Serban, Adriana
    Linköping University, Department of Science and Technology, Physics and Electronics. Linköping University, The Institute of Technology.
    Gong, Shaofang
    Linköping University, Department of Science and Technology, Physics and Electronics. Linköping University, The Institute of Technology.
    Frequency Synthesizer With Dual Loop Frequency and Gain Calibration2013In: IEEE Transactions on Circuits and Systems Part 1: Regular Papers, ISSN 1549-8328, E-ISSN 1558-0806, Vol. 60, no 11, p. 2911-2919Article in journal (Refereed)
    Abstract [en]

    A 3600-MHz phase-locked loop based frequency synthesizer for UMTS applications has been developed in 0.18 $mu$ m CMOS. It incorporates a VCO frequency and loop-gain calibration technique that allows an integrated VCO frequency tuning range of 28% and a low VCO gain ($K_{rm VCO}$ of 30 MHz/V. The loop-gain calibration can compensate for not only variations in VCO gain and divider modulus, but also charge-pump current and loop filter capacitance to an accuracy of 5%. The PLL settles in 150 $mu$s including frequency and gain calibrations. No switches are used in the loop filter. The output phase noise at 1-MHz offset is ${-}123$ dBc/Hz and the integrated phase error (1 kHz–2 MHz) is 1.26 $^{circ}$.

  • 7.
    Jakobsson, Anders
    et al.
    Huawei Technologies Sweden AB, Kista, Sweden.
    Serban, Adriana
    Linköping University, Department of Science and Technology, Physics and Electronics. Linköping University, Faculty of Science & Engineering.
    Gong, Shaofang
    Linköping University, Department of Science and Technology, Physics and Electronics. Linköping University, Faculty of Science & Engineering.
    A Low Noise RC-based Phase Interpolator in 16-nm CMOS2019In: IEEE Transactions on Circuits and Systems - II - Express Briefs, ISSN 1549-7747, E-ISSN 1558-3791, Vol. 66, no 1Article in journal (Refereed)
    Abstract [en]

    This paper describes a passive analog phase interpolator, utilizing a switched RC-network. The proposed circuit eliminates the current sources in a phase interpolator based on constant-slope charging. By eliminating the current source, the noise is significantly reduced due to the reduction in thermal and flicker noise. The phase interpolator has a resolution of 6 bits and is implemented in a 16-nm CMOS process. The maximum differential non-linearity is measured to be 0.1 LSBs at a 192 ps input time delta. The circuit draws 0.2 mW from a 0.8 V supply, and occupies 0.004 mm2.

  • 8.
    Jakobsson, Anders
    et al.
    Huawei Technol Sweden AB, S-16494 Kista, Sweden.
    Serban, Adriana
    Linköping University, Department of Science and Technology, Physics and Electronics. Linköping University, The Institute of Technology.
    Gong, Shaofang
    Linköping University, Department of Science and Technology, Physics and Electronics. Linköping University, The Institute of Technology.
    Implementation of Quantized-State System Models for a PLL Loop Filter Using Verilog-AMS2015In: IEEE Transactions on Circuits and Systems Part 1: Regular Papers, ISSN 1549-8328, E-ISSN 1558-0806, Vol. 62, no 3, p. 680-688Article in journal (Refereed)
    Abstract [en]

    A method to implement quantized-state system (QSS) models in industry standard RF-IC design tools is proposed. The method is used to model a GHz-range 0.18 um CMOS phase-locked loop (PLL), and enables a truly event-driven simulation of the entire mixed-signal PLL circuit. First- and second-order (QSS and QSS2, respectively) models of the PLL loop-filter implemented in Verilog-AMS are first described in detail. These models do not rely on analog nets, and use only the event-based solver. Then, simulation results are compared to reference SPICE simulation results to prove the validity of the QSS method. The entire PLL circuit is finally simulated using the QSS model of the loop-filter, charge-pump and VCO, in conjunction with standard high-level models of the PLL digital circuits. To verify the proposed QSS method, measured phase noise is compared with simulated phase noise. It is shown that simulated phase noise accurately predicts the measured phase noise with improved accuracy, and an increase in simulation efficiency by more than 50 times. Measured and simulated results generally demonstrate the feasibility of the QSS modeling for mixed-signal circuit simulation and design.

  • 9.
    Karlsson, Magnus
    et al.
    Linköping University, Department of Science and Technology. Linköping University, The Institute of Technology.
    Owais, Owais
    Linköping University, Department of Science and Technology. Linköping University, The Institute of Technology.
    Östh, Joakim
    Linköping University, Department of Science and Technology. Linköping University, The Institute of Technology.
    Serban, Adriana
    Linköping University, Department of Science and Technology. Linköping University, The Institute of Technology.
    Gong, Shaofang
    Linköping University, The Institute of Technology. Linköping University, Department of Science and Technology, Physics and Electronics.
    Jobs, Magnus
    Uppsala University.
    Gruden, Mathias
    Uppsala University.
    Dipole Antenna With Integrated Balun For Ultra-wideband Radio 6-9 GHz2011In: Microwave and optical technology letters (Print), ISSN 0895-2477, E-ISSN 1098-2760, Vol. 53, no 1, p. 180-184Article in journal (Refereed)
    Abstract [en]

    A fully integrated dipole antenna with a balun fot ulna wideband (UWB) radio in the band 6-9 GHz utilizing a flexible and rigid printed count board is presented in this at tide The balun utilizes broadside coupled microstrips and is integrated in the rigid part of the printed coma boat d whereas the radiator is placed in the flexible pat! The antenna with the balun covets the frequency band 6 0-8 5 GHz at voltage standing mate ratio (VSWR) andlt;2 0 and 55-110 GHz at VSWR andlt; 2 5 Moreover simulated and measured radiation patterns and antenna efficiency above 860% are observed

  • 10.
    Karlsson, Magnus
    et al.
    Linköping University, Department of Science and Technology, Physics and Electronics. Linköping University, The Institute of Technology.
    Serban, Adriana
    Linköping University, Department of Science and Technology, Physics and Electronics. Linköping University, The Institute of Technology.
    Östh, Joakim
    Linköping University, Department of Science and Technology, Physics and Electronics. Linköping University, The Institute of Technology.
    Owais, Owais
    Linköping University, Department of Science and Technology, Physics and Electronics. Linköping University, The Institute of Technology.
    Gong, Shaofang
    Linköping University, Department of Science and Technology, Physics and Electronics. Linköping University, The Institute of Technology.
    Frequency Triplexer for Ultra-Wideband Systems (6–9 GHz)2013In: IEEE Transactions on Circuits and Systems Part 1: Regular Papers, ISSN 1549-8328, E-ISSN 1558-0806, Vol. 60, no 3, p. 540-547Article in journal (Refereed)
    Abstract [en]

    A triplexer for ultra-wideband radio implemented entirely with distributed microstrips is presented. The triplexer is composed of a triplex junction network and three bandpass filters. The circuit is integrated in a flex-rigid printed circuit board. Three flat 1 GHz sub-bands in the frequency band 6-9 GHz have been achieved. The group delay variation within each 1 GHz sub-band was measured to be less than 0.4 ns. A good agreement between simulation and measurement was obtained, e.g., less than 0.3 dB difference in the forward transmission in the majority of the frequency band.

  • 11.
    Karlsson, Magnus
    et al.
    Linköping University, The Institute of Technology. Linköping University, Department of Science and Technology.
    Serban Craciunescu, Adriana
    Linköping University, The Institute of Technology. Linköping University, Department of Science and Technology.
    UWB för trådlös och hög hastighetsdata överföring2006In: Energi, IT och Design,2006, 2006, p. 24-24Conference paper (Other academic)
    Abstract [sv]

    Trådlös kommunikation är en del av vardagen i det moderna samhället. Allt eftersom nya behov dyker upp så ökar kravet på effektivitet och kapacitet i systemen. Fler system som dock ofta är inkompatibla med varandra har varit en klar trend de senaste åren. Intresset ökar för att samordna dem för att spara både energi och material. Konsekvensen blir krav på strömsnål elektronik som samtidigt förväntas att klara allt mer. -Ultra-wideband radio- (UWB, sv. bredbandig radio) är en ny lovande strömsnål teknologi för att möta dessa krav. Det kan låta motsägelsefullt med bredbandiga signaler och låg strömförbrukning. Genom att just sprida ut signalen över ett brett frekvensområde så kan väldigt svaga signaler användas, signalstyrkan som används ligger under det naturliga brusgolvet. Informationen skickas som korta pulser utan bärvåg. Hemmen fylls allt mer av modern elektronik, allt från CD, DVD med mera. Ofta är det dessutom inte nog med en av varje för att man vill kunna titta på favoritfilmen både i vardagsrummet och i sovrummet. Med UWB kan uppgifter samordnas och en mediacentral kan förse flera användare, på så sätt minskar man antalet maskiner som förbrukar energi. Förutom strömmande media applikationer kan man exempelvis överföra data mellan sin bärbara och sin stationära dator. Alla kortdistansdataöverföringar som idag görs med kabel eller någon annan trådlös teknik kan istället ersättas med UWB. Gruppnamnet för den här typen av tjänster är -Wireless personal area network- (WPAN, sv. trådlöst personligt nätverk). Bortsett från att lösa olika överföringsbehov så kan UWB användas till -imaging- system, som kan liknas med högupplöst radar. Skillnaden mot klassisk lågupplöst radar är att man får information om objektet ifråga och inte bara uppgift om att det finns något i en viss riktning. Ett tredje intressant användningsområde är sensorer. Höghastighetssystem som UWB förknippas sällan med sensornätverk men tekniken är strömsnål och datamängden är lätt att skala ner så att övriga komponenter inte kräver för mycket ström. Aktiva RFID (radiofrekvensidentifikation) brickor är ett ytterligare användningsområde. Nyckeln för den breda användbarheten är låg strömförbrukning per verförd information i kombination med skalbarhet. Detta sammantaget resulterar i att UWB kan designas för att med bibehållet höga krav på låg energiförbrukning väl kan möta många informationstekniska behov.

  • 12.
    Karlsson, Magnus
    et al.
    Linköping University, Department of Science and Technology, Physics and Electronics. Linköping University, The Institute of Technology.
    Östh, Joakim
    Linköping University, Department of Science and Technology, Physics and Electronics. Linköping University, The Institute of Technology.
    Serban, Adriana
    Linköping University, Department of Science and Technology, Physics and Electronics. Linköping University, The Institute of Technology.
    Gong, Shaofang
    Linköping University, Department of Science and Technology, Physics and Electronics. Linköping University, The Institute of Technology.
    Circular Dipole Antennas for Lower and Upper UWB Bands with Integrated Balun2009In: 2009 IEEEInternational Conference on Ultra-Wideband: Proceedings, 9th to 11th September 2009, Vancouver, BC, Canada, Vancover: IEEE , 2009, p. 658-663Conference paper (Refereed)
    Abstract [en]

    Abstract—Two fully integrated dipole antennas with balun for ultra-wideband (UWB) radio utilizing a flexible and rigid printed circuit board are presented in this paper. The concept in this paper is to take advantage of the respective possibilities of the rigid and the flexible part. The balun utilizes broadside-coupled microstrips and is integrated in the rigid part of the printed circuit board, while the radiator is placed in the flexible part. The lower UWB band antenna with the balun covers the frequency-band 3.1-4.8 GHz (with margin) at VSWR<2.0. The upper UWB band antenna with the balun covers the frequency-band 6.0-8.5 GHz (with margin) at VSWR<2.0, and 5.5-11.0 GHz at VSWR<2.5.

  • 13.
    Owais, Owais
    et al.
    Linköping University, Department of Science and Technology, Physics and Electronics. Linköping University, The Institute of Technology.
    Östh, Joakim
    Linköping University, Department of Science and Technology, Physics and Electronics. Linköping University, The Institute of Technology.
    Serban, Adriana
    Linköping University, Department of Science and Technology, Physics and Electronics. Linköping University, The Institute of Technology.
    Karlsson, Magnus
    Linköping University, Department of Science and Technology, Physics and Electronics. Linköping University, The Institute of Technology.
    Gong, Shaofang
    Linköping University, Department of Science and Technology, Physics and Electronics. Linköping University, The Institute of Technology.
    Differential Six-Port Demodulator2011In: Microwave and optical technology letters (Print), ISSN 0895-2477, E-ISSN 1098-2760, Vol. 53, no 9, p. 2192-2197Article in journal (Refereed)
    Abstract [en]

    A differential six-port demodulator for the 7-8 GHz band is reported for the first time. It is composed of a differential six-port correlator on the two sides of the substrate and zero-bias antiparallel Schottky diodes acting as power detectors. It is theoretically analyzed and also simulated. A prototype has been fabricated and data transmission at 0.8 Gbit/s (but not the maximum) with the 16 quadrature amplitude modulation (QAM) is experimentally demonstrated.

  • 14.
    Owais, Owais
    et al.
    Linköping University, Department of Science and Technology, Physics and Electronics. Linköping University, The Institute of Technology.
    Östh, Joakim
    Linköping University, Department of Science and Technology, Physics and Electronics. Linköping University, The Institute of Technology.
    Serban, Adriana
    Linköping University, Department of Science and Technology, Physics and Electronics. Linköping University, The Institute of Technology.
    Karlsson, Magnus
    Linköping University, Department of Science and Technology, Physics and Electronics. Linköping University, The Institute of Technology.
    Gong, Shaofang
    Linköping University, Department of Science and Technology, Physics and Electronics. Linköping University, The Institute of Technology.
    Differential Six-Port TransceiverManuscript (preprint) (Other academic)
    Abstract [en]

    A differential six-port transceiver for the 7-8 GHz band is presented for the rst time. It is fabricated using double-sided parallel-strip lines. The transmitter is composed of a differential six-port correlator with a quarter wavelength arrangement for carrier suppression. Cold-mode field effect transistors are used as impedance terminations, controlled via baseband signals on the gate to source terminal. The receiver is comprised of a differential six-port correlator and diode detectors. The diodes on the front-side and the back-side are connected in antiparallel, resulting in a differential input and differential output six-port receiver. The main features of the transceiver are low complexity, low power consumption, and high data rate. Data transmission and reception with the transceiver is demonstrated with quadrature phase shift keying (QPSK) and 16-quadrature amplitude modulation (16-QAM) with 100 and 200 M symbol / s , respectively.

  • 15.
    Serban, Adriana
    Linköping University, Department of Science and Technology, Physics and Electronics. Linköping University, The Institute of Technology.
    Ultra-Wideband Low-Noise Amplifier andSix-Port Transceiver for High Speed DataTransmission2010Doctoral thesis, comprehensive summary (Other academic)
    Abstract [en]

    Today’s data rates in wired networks can reach 100 Gbit/s using optical fiber while data rates in wireless networks are much lower - tens of Mbit/s for 3G mobile communication and 480 Mbit/s for ultra-wideband (UWB) short range wireless communications. This difference in data rates can mainly be explained by the limited allowed frequency spectrum, the nature of the radio signal and the high requirements imposed on all hardware designed for high speed and wideband wireless communications. However, the demand on wireless commercial applications at competitive costs is growing. The first step in regulations allowing higher data rates for wireless communications was taken in 2002, when the Federal Communication Commission (FCC) in USA released unlicensed the 3.1-10.6 GHz frequency band restricting only the power level (maximum mean equivalent isotropic radiated power density of a UWB transmitter is -41.3 dBm/MHz) in the band 3.1-10.6 GHz. But Europe, Japan and recently China have put additional restrictions on the 3.1-4.8 GHz band. The restrictions address the problems that have raised from the coexistence and colocation of the UWB systems with other narrowband wireless systems. Thus, the 6-9 GHz band combined with an increased modulation order scheme is of large interest.

    Operating at higher frequency and wider bandwidth than today’s communication technologies, with the general task of maximizing the wireless data rate while keeping the power consumption low, requires new communication system solutions and new circuit design approaches. These new solutions also require understanding of many multi-disciplinary areas which until the recent past were not directly related: from classic analog circuit design to microwave design, from modulation techniques to radio system architecture.

    In this thesis, new design techniques for wide bandwidth circuits above 3 GHz are presented. After focusing on ultra-wideband low-noise amplifier (UWB LNA) design for low-power and low-cost applications, the practical implementation and measurement of a 3.1-4.8 GHz UWB LNA is addressed. Passive distributed components of microstrip transmission lines are intensively used and their contribution to the UWB LNA performance is studied. In order to verify the design methodology while extending it to the UWB radio front-end,

    the UWB LNA is integrated on the same substrate with a pre-selecting filter with the frequency multiplexing function. In this way, the concept of frequencytriplexed UWB front-end is demonstrated for the Mode 1 multi-band UWB bandwidth 3.1-4.8 GHz. Using the proposed receiver front-end topology, better receiver sensitivity and selective operation can be achieved.

    The later part of the thesis investigates ultra-wideband 6-9 GHz receiver and transmitter front-end topologies for Gbit/s data rates and low power consumption. To capture the advantages offered by distributed passive components, both the transmitter and receiver use the six-port correlator as the core of a passive mixer. Modelling and design of the 6-9 GHz UWB front-end transceiver include different receiver topologies and different modulation schemes. Finally, the 7.5 GHz UWB transceiver front-end is implemented and evaluated. Measurement results confirm the large potential of the six-port UWB front-end to achieve multiple Gbit/s data rates. This may open for future solutions to meet the continuous challenge of modern communication systems: higher data rates at low power consumption and low cost.

    List of papers
    1. Compontent Tolerance Effect on Ultra-Wideband Low-Noise Amplifier Performance
    Open this publication in new window or tab >>Compontent Tolerance Effect on Ultra-Wideband Low-Noise Amplifier Performance
    2010 (English)In: IEEE Transactions on Advanced Packaging, ISSN 1521-3323, E-ISSN 1557-9980, Vol. 33, no 3, p. 660-668Article in journal (Refereed) Published
    Abstract [en]

    A study of the component tolerances on an ultra-wideband low-noise amplifier designed on a conventional printed circuit board is presented in this paper. The low-noise amplifier design employs dual-section input and output microstrip matching networks for wideband operation with a low noise figure and a flat power gain. Firstly, the effect of passive component and manufacturing process tolerances on the low-noise amplifier performance is theoretically studied by means of sensitivity analyses. Secondly, simulation and measurement results are presented for verification of the analytical results. It is shown that, compared with a lumped matching network design, a microstrip matching network design significantly reduces the ultra-wideband low-noise amplifier sensitivity to component tolerances.

    Place, publisher, year, edition, pages
    IEEE, 2010
    Keywords
    Low-noise amplifier, matching networks, sensitivity analysis, ultrawideband, UWB
    National Category
    Natural Sciences
    Identifiers
    urn:nbn:se:liu:diva-53604 (URN)10.1109/TADVP.2010.2041348 (DOI)000286011100010 ()
    Note

    ©2011 IEEE. Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the IEEE. Adriana Serban, Magnus Karlsson and Shaofang Gong, Compontent Tolerance Effect on Ultra-Wideband Low-Noise Amplifier Performance, 2011, IEEE Transactions on Advanced Packaging, (33), 3, 660-668. http://dx.doi.org/10.1109/TADVP.2010.2041348

    Available from: 2010-01-26 Created: 2010-01-26 Last updated: 2019-06-17Bibliographically approved
    2. Six-port transceiver for 6-9 GHz ultrawideband systems
    Open this publication in new window or tab >>Six-port transceiver for 6-9 GHz ultrawideband systems
    Show others...
    2010 (English)In: Microwave and optical technology letters (Print), ISSN 0895-2477, E-ISSN 1098-2760, Vol. 42, no 3, p. 740-746Article in journal (Refereed) Published
    Abstract [en]

    An ultrawideband 6-9 GHz six-port correlator is designed and manufactured.Based on this six-port correlator, behavioral models, and true component circuit designs of a transceiver are developed to study the performance of the proposed direct conversion ultrawideband transceiver topology. A new six-port modulator with controllable impedance terminations implemented with a field effect transistor in the linear operation region is presented

    Keywords
    Six-port transceiver, six-port transmitter, six-port receiver, UWB systems
    National Category
    Natural Sciences
    Identifiers
    urn:nbn:se:liu:diva-53605 (URN)10.1002/mop.25021 (DOI)000274363700062 ()
    Note
    On the day of the defence day the status of this article was: Accepted.Available from: 2010-01-26 Created: 2010-01-26 Last updated: 2019-06-17
    3. A Frequency-triplexed RF Front-end for Ultra-wideband Systems 3.1-4.8 GHz
    Open this publication in new window or tab >>A Frequency-triplexed RF Front-end for Ultra-wideband Systems 3.1-4.8 GHz
    2008 (English)In: ISAST Transactions on Electronics and Signal Processing, ISSN 1797-2329, Vol. 1, no 2, p. 83-88Article in journal (Refereed) Published
    Abstract [en]

    A multi-band and ultra-wideband (UWB) 3.1-4.8 GHz receiver front-end consisting of a fully integrated filter and triplexer network, and a flat gain low-noise amplifier (LNA) is presented in this paper. The front-end utilizes a microstrip network and three combined broadside- and edge-coupled bandpass filters to connect the three sub-bands. The LNA design employs dual-section input and output microstrip matching networks for wideband operation with a flat power gain and a low noise figure. The system is fully integrated in a four-metal-layer printed circuit board. The measured power gain is 10 dB and the noise figure of the front-end is 6 dB at each center frequency of the three sub-bands. The minimum isolation between the sub-bands is -27 dB and the isolation between the non-neighboring alternate sub-bands is -52 dB. The out-of-band interferer attenuation is below -30 dB.

    National Category
    Engineering and Technology
    Identifiers
    urn:nbn:se:liu:diva-12802 (URN)
    Note
    The status of this article was previously Submitted.Available from: 2008-01-07 Created: 2008-01-07 Last updated: 2019-06-17Bibliographically approved
    4. Microstrip Bias Networks for Ultra-Wideband Systems
    Open this publication in new window or tab >>Microstrip Bias Networks for Ultra-Wideband Systems
    2008 (English)In: ISAST Transactions on Electronics and Signal Processing, ISSN 1797-2329, Vol. 1, no 2, p. 16-20Article in journal (Refereed) Published
    Abstract [en]

    Bias networks with radio frequency (RF) chokes can be implemented using different microstrip elements. They can have different advantages in terms of bandwidth and occupied area. However, sharp discontinuities of the transfer functions have been observed in these types of bias networks. In this paper they are explained by resonances generated within the DC path of the bias network. As the resonance behavior degrades the performance of broadband RF circuits, the robustness of different bias networks against resonance was investigated. Different bias networks were fabricated and measured. Both simulation and experimental results show that broadband microstrip bias networks can be optimized to avoid or reduce the resonance phenomena.

    Keywords
    Bias networks, microstrip components
    National Category
    Engineering and Technology
    Identifiers
    urn:nbn:se:liu:diva-12801 (URN)
    Available from: 2008-01-07 Created: 2008-01-07 Last updated: 2019-06-17Bibliographically approved
    5. All-Microstrip Design of Three Multiplexed Antennas and LNA for UWB Systems
    Open this publication in new window or tab >>All-Microstrip Design of Three Multiplexed Antennas and LNA for UWB Systems
    2006 (English)In: Asia-Pacific Microwave Conf., December 2006, 2006, p. 1106-1109Conference paper, Published paper (Refereed)
    Abstract [en]

    An ultra-wideband (UWB) 3.1-4.8 GHz radio front-end consisting of three frequency multiplexed antennas and a low-noise amplifier (LNA) is presented in this paper. Using one antenna for each sub-band and an LNA designed for maximum-flat power gain provides equal performance within the entire frequency band. Frequency multiplexing is used to combine the antennas for multi-band UWB. The LNA is optimized for wideband operation and minimum noise figure. The LNA design employs dual-section input and output matching networks. The antennas, the frequency multiplexing network, the matching networks and the bias circuit of the LNA are all implemented using microstrip lines.

    Keywords
    antenna arrays, frequency division multiplexing, low noise amplifiers, microstrip antennas, microwave amplifiers, microwave antennas, ultra wideband antennas, wideband amplifiers, LNA, UWB systems, bias circuit, dual-section matching networks, frequency 3.1 GHz to 4.8 GHz, frequency multiplexed antennas, microstrip design, microstrip lines, multiband UWB, ultra-wideband radio front-end
    National Category
    Engineering and Technology
    Identifiers
    urn:nbn:se:liu:diva-12798 (URN)10.1109/APMC.2006.4429602 (DOI)978-4-902339-08-6 (ISBN)
    Available from: 2008-01-07 Created: 2008-01-07 Last updated: 2019-06-17Bibliographically approved
    6. Radio Architecture for Parallel Processing of Extremely High Speed Data
    Open this publication in new window or tab >>Radio Architecture for Parallel Processing of Extremely High Speed Data
    Show others...
    2009 (English)In: IEEE International Conference on Ultra-Wideband, ICUWB, Vancouver, Canada, 9-11 Sept., IEEE , 2009, p. 433-437Conference paper, Published paper (Refereed)
    Abstract [en]

    Using our own-developed frequency multiplexing network, a radio architecture for parallel radio signal processing has been proposed for achieving extremely high data rate above 10 Gbit/s. To meet the high requirement on phase linearity, amplitude balance and low noise figure in a very large bandwidth, our own-developed ultra-wideband six-port correlator has been utilized for the modulator and demodulator in the radio architecture.

    Place, publisher, year, edition, pages
    IEEE, 2009
    Keywords
    radio architecture, parallel processing, wireless data, high speed
    National Category
    Natural Sciences
    Identifiers
    urn:nbn:se:liu:diva-53606 (URN)10.1109/ICUWB.2009.5288704 (DOI)978-1-4244-2930-1 (ISBN)
    Available from: 2010-01-26 Created: 2010-01-26 Last updated: 2019-06-17Bibliographically approved
    7. Six-Port Direct Carrier Modulator at 7.5 GHz for Ultra-Wideband  Appliations
    Open this publication in new window or tab >>Six-Port Direct Carrier Modulator at 7.5 GHz for Ultra-Wideband  Appliations
    Show others...
    (English)Manuscript (preprint) (Other academic)
    Abstract [en]

    A 7.5 GHz direct-carrier modulator for multi-level quadrature amplitude modulation (M-QAM) using a wideband 7-8 GHz six-port correlator and four controllable impedance terminations implemented with field-effect transistors (FET) is presented in this paper. The proposed encoding schemes of the reflection-type modulator is based on equal impedance values at I and Q ports, such that Γ3 = Γ4 and Γ5 = Γ6 for every symbol in the constellation diagram. The field-effect transistors are operated at zero drain-source voltage (cold-FET). The FET-impedance termination topology includes a source resistor (RS) and a gate resistor (RG) for symmetrical spreading of the reflection coefficients around the origin. In order to validate the 7.5 GHz six-port modulator with cold-FET impedance terminations, the six-port modulator prototype has been realized on a ROGERS4350B substrate of 0.254-mm thickness and tested with a six-port demodulator (receiver). The six-port modulator was measure to have symbol rates of 10 Msymbol/s with QPSK (= 20 Mbit/s) and 250 Msymbol/s with 16-QAM (= 1 Gbit/s).

    Keywords
    Terms—modulator, six-port, ultra-wideband
    National Category
    Natural Sciences
    Identifiers
    urn:nbn:se:liu:diva-53608 (URN)978-1-4244-2930-1 (ISBN)
    Available from: 2010-01-26 Created: 2010-01-26 Last updated: 2019-06-17Bibliographically approved
  • 16.
    Serban, Adriana
    et al.
    Linköping University, Department of Science and Technology. Linköping University, The Institute of Technology.
    Karlsson, Magnus
    Linköping University, Department of Science and Technology. Linköping University, The Institute of Technology.
    Gong, Shaofang
    Linköping University, Department of Science and Technology. Linköping University, The Institute of Technology.
    A Frequency-triplexed RF Front-end for Ultra-wideband Systems 3.1-4.8 GHz2008In: ISAST Transactions on Electronics and Signal Processing, ISSN 1797-2329, Vol. 1, no 2, p. 83-88Article in journal (Refereed)
    Abstract [en]

    A multi-band and ultra-wideband (UWB) 3.1-4.8 GHz receiver front-end consisting of a fully integrated filter and triplexer network, and a flat gain low-noise amplifier (LNA) is presented in this paper. The front-end utilizes a microstrip network and three combined broadside- and edge-coupled bandpass filters to connect the three sub-bands. The LNA design employs dual-section input and output microstrip matching networks for wideband operation with a flat power gain and a low noise figure. The system is fully integrated in a four-metal-layer printed circuit board. The measured power gain is 10 dB and the noise figure of the front-end is 6 dB at each center frequency of the three sub-bands. The minimum isolation between the sub-bands is -27 dB and the isolation between the non-neighboring alternate sub-bands is -52 dB. The out-of-band interferer attenuation is below -30 dB.

  • 17.
    Serban, Adriana
    et al.
    Linköping University, Department of Science and Technology. Linköping University, The Institute of Technology.
    Karlsson, Magnus
    Linköping University, Department of Science and Technology. Linköping University, The Institute of Technology.
    Gong, Shaofang
    Linköping University, Department of Science and Technology. Linköping University, The Institute of Technology.
    Compontent Tolerance Effect on Ultra-Wideband Low-Noise Amplifier Performance2010In: IEEE Transactions on Advanced Packaging, ISSN 1521-3323, E-ISSN 1557-9980, Vol. 33, no 3, p. 660-668Article in journal (Refereed)
    Abstract [en]

    A study of the component tolerances on an ultra-wideband low-noise amplifier designed on a conventional printed circuit board is presented in this paper. The low-noise amplifier design employs dual-section input and output microstrip matching networks for wideband operation with a low noise figure and a flat power gain. Firstly, the effect of passive component and manufacturing process tolerances on the low-noise amplifier performance is theoretically studied by means of sensitivity analyses. Secondly, simulation and measurement results are presented for verification of the analytical results. It is shown that, compared with a lumped matching network design, a microstrip matching network design significantly reduces the ultra-wideband low-noise amplifier sensitivity to component tolerances.

  • 18.
    Serban, Adriana
    et al.
    Linköping University, Department of Science and Technology. Linköping University, The Institute of Technology.
    Karlsson, Magnus
    Linköping University, Department of Science and Technology. Linköping University, The Institute of Technology.
    Gong, Shaofang
    Linköping University, Department of Science and Technology. Linköping University, The Institute of Technology.
    Microstrip Bias Networks for Ultra-Wideband Systems2008In: ISAST Transactions on Electronics and Signal Processing, ISSN 1797-2329, Vol. 1, no 2, p. 16-20Article in journal (Refereed)
    Abstract [en]

    Bias networks with radio frequency (RF) chokes can be implemented using different microstrip elements. They can have different advantages in terms of bandwidth and occupied area. However, sharp discontinuities of the transfer functions have been observed in these types of bias networks. In this paper they are explained by resonances generated within the DC path of the bias network. As the resonance behavior degrades the performance of broadband RF circuits, the robustness of different bias networks against resonance was investigated. Different bias networks were fabricated and measured. Both simulation and experimental results show that broadband microstrip bias networks can be optimized to avoid or reduce the resonance phenomena.

  • 19.
    Serban, Adriana
    et al.
    Linköping University, Department of Science and Technology, Physics and Electronics. Linköping University, The Institute of Technology.
    Karlsson, Magnus
    Linköping University, Department of Science and Technology, Physics and Electronics. Linköping University, The Institute of Technology.
    Östh, Joakim
    Linköping University, Department of Science and Technology, Physics and Electronics. Linköping University, The Institute of Technology.
    Owais, Owais
    COMSATS Institute of Information Technology, .
    Gong, Shaofang
    Linköping University, Department of Science and Technology, Physics and Electronics. Linköping University, The Institute of Technology.
    Differential Circuit Technique for Six-Port Modulator and Demodulator2012In: Microwave Symposium Digest (MTT), 2012 IEEE MTT-S International, IEEE , 2012, p. 1-3Conference paper (Refereed)
    Abstract [en]

    Targeting the differential RF/microwave circuit design methodology for improved broadband wireless data transmission, a novel differential 7.5 GHz six-port modulator and demodulator pair was designed and manufactured. Measurements show a good 256-QAM modulated signal at 50 Msymbol/s and an accurately 16-QAM demodulated signal at 200 Msymbol/s.

  • 20.
    Serban, Adriana
    et al.
    Linköping University, Department of Science and Technology, Physics and Electronics. Linköping University, The Institute of Technology.
    Östh, Joakim
    Linköping University, Department of Science and Technology. Linköping University, The Institute of Technology.
    Karlsson, Magnus
    Linköping University, Department of Science and Technology. Linköping University, The Institute of Technology.
    Owais, Owais
    Linköping University, Department of Science and Technology. Linköping University, The Institute of Technology.
    Haartsen, Jaap
    Sony Ericsson Mobile Communications AB, Lund, Sweden.
    Karlsson, Peter
    Sony Ericsson Mobile Communications AB, Lund, Sweden.
    Six-Port Direct Carrier Modulator at 7.5 GHz2010In: Proceedings of GigaHertz 2010, 2010Conference paper (Refereed)
  • 21.
    Serban, Adriana
    et al.
    Linköping University, Department of Science and Technology. Linköping University, The Institute of Technology.
    Östh, Joakim
    Linköping University, Department of Science and Technology. Linköping University, The Institute of Technology.
    Owais, Owais
    Linköping University, Department of Science and Technology. Linköping University, The Institute of Technology.
    Karlsson, Magnus
    Linköping University, Department of Science and Technology. Linköping University, The Institute of Technology.
    Gong, Shaofang
    Linköping University, Department of Science and Technology. Linköping University, The Institute of Technology.
    Haartsen, Jaap
    Sony Ericsson Mobile Communications AB, Lund, Sweden.
    Karlsson, Peter
    Sony Ericsson Mobile Communications AB, Lund, Sweden.
    Six-Port Direct Carrier Modulator at 7.5 GHz for Ultra-Wideband  AppliationsManuscript (preprint) (Other academic)
    Abstract [en]

    A 7.5 GHz direct-carrier modulator for multi-level quadrature amplitude modulation (M-QAM) using a wideband 7-8 GHz six-port correlator and four controllable impedance terminations implemented with field-effect transistors (FET) is presented in this paper. The proposed encoding schemes of the reflection-type modulator is based on equal impedance values at I and Q ports, such that Γ3 = Γ4 and Γ5 = Γ6 for every symbol in the constellation diagram. The field-effect transistors are operated at zero drain-source voltage (cold-FET). The FET-impedance termination topology includes a source resistor (RS) and a gate resistor (RG) for symmetrical spreading of the reflection coefficients around the origin. In order to validate the 7.5 GHz six-port modulator with cold-FET impedance terminations, the six-port modulator prototype has been realized on a ROGERS4350B substrate of 0.254-mm thickness and tested with a six-port demodulator (receiver). The six-port modulator was measure to have symbol rates of 10 Msymbol/s with QPSK (= 20 Mbit/s) and 250 Msymbol/s with 16-QAM (= 1 Gbit/s).

  • 22.
    Serban, Adriana
    et al.
    Linköping University, Department of Science and Technology. Linköping University, The Institute of Technology.
    Östh, Joakim
    Linköping University, Department of Science and Technology. Linköping University, The Institute of Technology.
    Owais, Owais
    Linköping University, Department of Science and Technology. Linköping University, The Institute of Technology.
    Karlsson, Magnus
    Linköping University, Department of Science and Technology. Linköping University, The Institute of Technology.
    Gong, Shaofang
    Linköping University, Department of Science and Technology. Linköping University, The Institute of Technology.
    Haartsen, Jaap
    Sony Ericsson Mobile Communications AB, Lund, Sweden.
    Karlsson, Peter
    Sony Ericsson Mobile Communications AB, Lund, Sweden.
    Six-port transceiver for 6-9 GHz ultrawideband systems2010In: Microwave and optical technology letters (Print), ISSN 0895-2477, E-ISSN 1098-2760, Vol. 42, no 3, p. 740-746Article in journal (Refereed)
    Abstract [en]

    An ultrawideband 6-9 GHz six-port correlator is designed and manufactured.Based on this six-port correlator, behavioral models, and true component circuit designs of a transceiver are developed to study the performance of the proposed direct conversion ultrawideband transceiver topology. A new six-port modulator with controllable impedance terminations implemented with a field effect transistor in the linear operation region is presented

  • 23.
    Serban Craciunescu, Adriana
    Linköping University, The Institute of Technology. Linköping University, Department of Science and Technology.
    Electomagnetic Simulations Improve High-Frequency Circuit Design2005In: The 6th International Balkan Workshop on Applied Physics,2005, 2005, p. 151-154Conference paper (Other academic)
    Abstract [en]

    Complex 3-D electromagnetic (EM) simulations of the entire 5 GHz low-noise amplifier (LNA) module enable accurate performance evaluation of the amplifier. Experimental results confirm the simulation results based on the LNA design with distributed matching networks.  

  • 24.
    Serban Craciunescu, Adriana
    Linköping University, Department of Science and Technology. Linköping University, The Institute of Technology.
    Low-Noise Amplifier Design for Ultra-Wideband Systems2006Licentiate thesis, comprehensive summary (Other academic)
    Abstract [en]

    The low-noise amplifier (LNA) remains a critical block in every receiver front-end. As the development of the widcband, low-power and low-cost wireless systems continues, new LNA topologies and design methodologies have become one of the most interesting challenges in the field of radio frequency system design. Optimally, wideband LNA design methodologies should provide improved receiver sensitivity and thus accurate low-level signal processing. The LNA design must handle trade-offs among LNA topology selection, wideband matching for low noise figure, flat power gain and wideband bias aspects. Another key factor of the wideband radio front-end design refers to the antenna-LNA eo-design. Any loss that occurs before the LNA in the system will substantially degrade the overall receiver sensitivity. In order to reduce losses and thus minimize the noise figure of the front-end, the LNA and the antenna or antenna-system should be designed simultaneously.

    The main focus of this thesis has been LNA design for ultra-wideband (UWB) applications. Firstly, an overview of the design techniques for wideband matching networks is given. Then, the way in which some classical single-stage LNA topologies are adapted to UWB specifications is analyzed. To verify the wideband amplifier design principles, both a narrowband LNA for 5.25 GHz and a UWB LNA for 3-5 GHz based on microstrip matching networks were designed, manufactured, and measured. Advanced design techniques, for example electromagnetic simulations of the entire layout of the LNA module were utilized. Optimization techniques and statistical analyses were also used in the design flow. Moreover, a co-design of an antenna-UWB LNA front-end was performed for the minimum noise figure and maximum flat power gain within the entire frequency band. Finally, UWB bias networks implemented with different microstrip elements were studied. It has been shown that, without accurate high-frequency component models and without including highfrequency electromagnetic coupling and component parasitics, LNA and particularly UWB LNA design can result in large errors. A good designapproach has large potential to improve the performance and manufacturing yield of LNAs, especially UWB LNAs.

    List of papers
    1. Low-Noise Amplifier Design at 5 GHz
    Open this publication in new window or tab >>Low-Noise Amplifier Design at 5 GHz
    2005 (English)In: IMAPS Nordic Annual Conference 2005: Proceedings of a meeting held 11-14 September 2005, Tonsberg, Norway, Curran Associates, Inc., 2005, p. 227-229Conference paper, Published paper (Refereed)
    Abstract [en]

    Two different designs of a low-noise amplifier (LNA) at 5 GHz are presented in this paper. The first design uses lumped elements for implementing the matching networks. The second design utilizes distributed element matching networks using microstrip lines. It is shown that the design using lumped element matching networks has difficulties to achieve high performance at a frequency of above 5 GHz and that distributed matching circuits are more adequate compared to the lumped element solution. Experimental results confirm the simulation results based on the LNA design with distributed matching networks

    Place, publisher, year, edition, pages
    Curran Associates, Inc., 2005
    National Category
    Engineering and Technology
    Identifiers
    urn:nbn:se:liu:diva-32319 (URN)18211 (Local ID)9781622761814 (ISBN)18211 (Archive number)18211 (OAI)
    Conference
    IMAPS Nordic Annual Conference 2005. 11-14 September 2005, Tonsberg, Norway
    Available from: 2009-10-09 Created: 2009-10-09 Last updated: 2015-03-18
    2. Ultrawideband Low-Noise Amplifier Design for 3.1-4.8 GHz
    Open this publication in new window or tab >>Ultrawideband Low-Noise Amplifier Design for 3.1-4.8 GHz
    2005 (English)In: Proceedings of GigaHertz 2005, Uppsala: GigaHertz 2005 , 2005, p. 291-194Conference paper, Published paper (Refereed)
    Abstract [en]

    An ultra-wideband (UWB) 3.1-4.8 GHz low-noise amplifier (LNA) employing two-section reactive input and output matching networks is presented in this paper. The amplifier is optimized for the minimum noise figure over the entire bandwidth and for maximum flat power gain. lf implemented in a narrowband system, the LNA can be matched for the optimal noise figure using simple one-section reactive input and output matching networks. However, if a wideband operation is required, the issue must be solved with other techniques. It is shown that with appropriate broadband matching techniques, Bands Group 1 ultra-wideband typical specifications can be achieved using a 5.25 GHz LNA. As a first step the design methodology focuses on noise figure optimization and continues with the optimization of the power gain. The nonidealities of the broadband matching networks implemented with microstrips are analyzed and their effects on the LNA performances are presented. The printed circuit board (PCB) manufacture process variations are included in the simulation setup. The substrate used is a double layer PCB with the Rogers material RO43508. The simulated LNA using microstrip matching networks achieved a noise figure smaller than 2.3 dB over the entire band and a flat power gain of 15.8 ± 0.14 dB.

    Place, publisher, year, edition, pages
    Uppsala: GigaHertz 2005, 2005
    National Category
    Engineering and Technology
    Identifiers
    urn:nbn:se:liu:diva-32377 (URN)18275 (Local ID)18275 (Archive number)18275 (OAI)
    Conference
    Gigahertz 2005, Uppsala, Sweden. Nov, 2005.
    Available from: 2009-10-09 Created: 2009-10-09 Last updated: 2015-03-18
    3. All-Microstrip Design of Three Multiplexed Antennas and LNA for UWB Systems
    Open this publication in new window or tab >>All-Microstrip Design of Three Multiplexed Antennas and LNA for UWB Systems
    2006 (English)In: Asia-Pacific Microwave Conf., December 2006, 2006, p. 1106-1109Conference paper, Published paper (Refereed)
    Abstract [en]

    An ultra-wideband (UWB) 3.1-4.8 GHz radio front-end consisting of three frequency multiplexed antennas and a low-noise amplifier (LNA) is presented in this paper. Using one antenna for each sub-band and an LNA designed for maximum-flat power gain provides equal performance within the entire frequency band. Frequency multiplexing is used to combine the antennas for multi-band UWB. The LNA is optimized for wideband operation and minimum noise figure. The LNA design employs dual-section input and output matching networks. The antennas, the frequency multiplexing network, the matching networks and the bias circuit of the LNA are all implemented using microstrip lines.

    Keywords
    antenna arrays, frequency division multiplexing, low noise amplifiers, microstrip antennas, microwave amplifiers, microwave antennas, ultra wideband antennas, wideband amplifiers, LNA, UWB systems, bias circuit, dual-section matching networks, frequency 3.1 GHz to 4.8 GHz, frequency multiplexed antennas, microstrip design, microstrip lines, multiband UWB, ultra-wideband radio front-end
    National Category
    Engineering and Technology
    Identifiers
    urn:nbn:se:liu:diva-12798 (URN)10.1109/APMC.2006.4429602 (DOI)978-4-902339-08-6 (ISBN)
    Available from: 2008-01-07 Created: 2008-01-07 Last updated: 2019-06-17Bibliographically approved
    4. Study of bias networks with RF choke for ultra-wideband systems
    Open this publication in new window or tab >>Study of bias networks with RF choke for ultra-wideband systems
    (English)Manuscript (preprint) (Other academic)
    Abstract [en]

    In this letter, bias networks with three different radio frequency chokes for ultra-wideband systems have been studied. The bias network with a butterfly stub results in not only the broadest band, but also the highest robustness. Resonances generated within the DC path of the bias network are investigated and explained. Both simulation and experimental results show that microstrip bias networks for ultra-wideband systems can be optimized to avoid or reduce the resonance phenomena.

    Keywords
    Amplifier, bias network, broadband, butterfly radial stub, microstrip, RF-choke
    National Category
    Engineering and Technology
    Identifiers
    urn:nbn:se:liu:diva-100919 (URN)
    Available from: 2013-11-14 Created: 2013-11-14 Last updated: 2019-06-17
  • 25.
    Serban Craciunescu, Adriana
    et al.
    Linköping University, Department of Science and Technology. Linköping University, The Institute of Technology.
    Gong, Shaofang
    Linköping University, Department of Science and Technology. Linköping University, The Institute of Technology.
    Low-Noise Amplifier Design at 5 GHz2005In: IMAPS Nordic Annual Conference 2005: Proceedings of a meeting held 11-14 September 2005, Tonsberg, Norway, Curran Associates, Inc., 2005, p. 227-229Conference paper (Refereed)
    Abstract [en]

    Two different designs of a low-noise amplifier (LNA) at 5 GHz are presented in this paper. The first design uses lumped elements for implementing the matching networks. The second design utilizes distributed element matching networks using microstrip lines. It is shown that the design using lumped element matching networks has difficulties to achieve high performance at a frequency of above 5 GHz and that distributed matching circuits are more adequate compared to the lumped element solution. Experimental results confirm the simulation results based on the LNA design with distributed matching networks

  • 26.
    Serban Craciunescu, Adriana
    et al.
    Linköping University, Department of Science and Technology. Linköping University, The Institute of Technology.
    Gong, Shaofang
    Linköping University, Department of Science and Technology. Linköping University, The Institute of Technology.
    Ultrawideband Low-Noise Amplifier Design for 3.1-4.8 GHz2005In: Proceedings of GigaHertz 2005, Uppsala: GigaHertz 2005 , 2005, p. 291-194Conference paper (Refereed)
    Abstract [en]

    An ultra-wideband (UWB) 3.1-4.8 GHz low-noise amplifier (LNA) employing two-section reactive input and output matching networks is presented in this paper. The amplifier is optimized for the minimum noise figure over the entire bandwidth and for maximum flat power gain. lf implemented in a narrowband system, the LNA can be matched for the optimal noise figure using simple one-section reactive input and output matching networks. However, if a wideband operation is required, the issue must be solved with other techniques. It is shown that with appropriate broadband matching techniques, Bands Group 1 ultra-wideband typical specifications can be achieved using a 5.25 GHz LNA. As a first step the design methodology focuses on noise figure optimization and continues with the optimization of the power gain. The nonidealities of the broadband matching networks implemented with microstrips are analyzed and their effects on the LNA performances are presented. The printed circuit board (PCB) manufacture process variations are included in the simulation setup. The substrate used is a double layer PCB with the Rogers material RO43508. The simulated LNA using microstrip matching networks achieved a noise figure smaller than 2.3 dB over the entire band and a flat power gain of 15.8 ± 0.14 dB.

  • 27.
    Serban (Craciunescu), Adriana
    et al.
    Linköping University, Department of Science and Technology. Linköping University, The Institute of Technology.
    Karlsson, Magnus
    Linköping University, Department of Science and Technology. Linköping University, The Institute of Technology.
    Gong, Shaofang
    Linköping University, Department of Science and Technology. Linköping University, The Institute of Technology.
    All-Microstrip Design of Three Multiplexed Antennas and LNA for UWB Systems2006In: Asia-Pacific Microwave Conf., December 2006, 2006, p. 1106-1109Conference paper (Refereed)
    Abstract [en]

    An ultra-wideband (UWB) 3.1-4.8 GHz radio front-end consisting of three frequency multiplexed antennas and a low-noise amplifier (LNA) is presented in this paper. Using one antenna for each sub-band and an LNA designed for maximum-flat power gain provides equal performance within the entire frequency band. Frequency multiplexing is used to combine the antennas for multi-band UWB. The LNA is optimized for wideband operation and minimum noise figure. The LNA design employs dual-section input and output matching networks. The antennas, the frequency multiplexing network, the matching networks and the bias circuit of the LNA are all implemented using microstrip lines.

  • 28.
    Serban Craciunescu, Adriana
    et al.
    Linköping University, Department of Science and Technology. Linköping University, The Institute of Technology.
    Karlsson, Magnus
    Linköping University, Department of Science and Technology. Linköping University, The Institute of Technology.
    Gong, Shaofang
    Linköping University, Department of Science and Technology. Linköping University, The Institute of Technology.
    Study of bias networks with RF choke for ultra-wideband systemsManuscript (preprint) (Other academic)
    Abstract [en]

    In this letter, bias networks with three different radio frequency chokes for ultra-wideband systems have been studied. The bias network with a butterfly stub results in not only the broadest band, but also the highest robustness. Resonances generated within the DC path of the bias network are investigated and explained. Both simulation and experimental results show that microstrip bias networks for ultra-wideband systems can be optimized to avoid or reduce the resonance phenomena.

  • 29.
    Serban (Craciunescu), Adriana
    et al.
    Linköping University, Department of Science and Technology, Physics and Electronics. Linköping University, Faculty of Science & Engineering.
    Morales, Oscar
    Linköping University, Department of Science and Technology. Linköping University, Faculty of Science & Engineering.
    Petersson, Tobias
    Linköping University, Department of Science and Technology. Linköping University, Faculty of Science & Engineering.
    Kalvér, Henrik
    Linköping University, Department of Science and Technology. Linköping University, Faculty of Science & Engineering.
    Ye, Qin-Zhong
    Linköping University, Department of Science and Technology, Physics and Electronics. Linköping University, Faculty of Science & Engineering.
    Multi-Port Front-End and DSP Co-Design for Vital Signs Detector2018Conference paper (Refereed)
    Abstract [en]

    Controlled wave interferometry within the passive multi-port (six-port) correlator with capability to accurately process phase information is shown to be a useful technique for microwave radar and wireless sensor applications. In this paper, the co-design and implementation of a complete hardware-software Doppler radar modular system for vital signs detection using the multi-port technology is presented. In contrast to multi-port radio applications, the challenge is to demonstrate the possibility to detect weak, Hz-range frequency signals.

  • 30.
    Tatu, Serioja Ovidiu
    et al.
    Institut National de la Recherche Scientifique, Montreal, Quebec, Canada.
    Serban, Adriana
    Linköping University, Department of Science and Technology, Physics and Electronics. Linköping University, The Institute of Technology.
    Helaoui, Mohamed
    University of Calgary, Canada.
    Koelpin, Alexander
    University of Erlangen-Nuremberg, Germany.
    Multiport Technology: The New Rise of an Old Concept2014In: IEEE Microwave Magazine, ISSN 1527-3342, E-ISSN 1557-9581, Vol. 15, no 7, p. 34-44Article in journal (Refereed)
    Abstract [en]

    This article provides an overview of the basics, possible applications, and specific calibration procedures for the six-port circuit, which is the most common multiport implementation of this promising architecture.

  • 31.
    Tatu, Serioja Ovidiu
    et al.
    Institut National de la Recherche Scientifique, Montréal, Québec, Canada.
    Serban, Adriana
    Linköping University, Department of Science and Technology, Physics and Electronics. Linköping University, The Institute of Technology.
    Koelpin, Alexander
    University of Erlangen-Nuremberg, Germany.
    Helaoui, Mohamed
    University of Calgary, Canada.
    Multiport technology: New perspectives and applications2014In: Journal of Electrical and Computer Engineering, ISSN 2090-0147, E-ISSN 2090-0155, Vol. 2014, no 194649Article in journal (Other academic)
    Abstract [en]

    Since 1994, the multiport techniques were further developed for microwave and millimeter-wave radios. Until today, several multiport architectures for specific applications, such as communication transceivers, radar, sensing, direction of arrival estimation, or phase noise measurements, have been developed and implemented.

    This special issue highlights, through several examples and multiple references, some of the modern applications of the multiport technology and significant advances in fabrication procedures, in the recent years.

  • 32.
    Wu, Duolong
    et al.
    School of Physics and Optoelectronic Engineering, Guangdong University of Technology, Guangzhou 510006, China.
    Serban, Adriana
    Linköping University, Department of Science and Technology, Physics and Electronics. Linköping University, Faculty of Science & Engineering.
    Karlsson, Magnus
    Linköping University, Department of Science and Technology, Physics and Electronics. Linköping University, Faculty of Science & Engineering.
    Gong, Shaofang
    Linköping University, Department of Science and Technology, Physics and Electronics. Linköping University, Faculty of Science & Engineering.
    Highly Unequal Three-Port Power Divider: Theory and Implementation2018In: International Journal of Antennas and Propagation, ISSN 1687-5869, E-ISSN 1687-5877, article id 9141964Article in journal (Refereed)
    Abstract [en]

    A three-port power divider consisting of a directional coupler, a Wilkinson power divider, and two transmission lines connected to them is proposed. Theoretical analysis reveals that highly unequal power division can be achieved by a feedback mechanism of two transmission lines along with the coupling coefficient of the directional coupler and the power division ratio of the Wilkinson power divider. The three-port power divider inherits the performance characteristics of high isolation, low reflection coefficients at all ports, and the minimum number of components. The proposed power divider is designed at 5.8 GHz and fabricated and evaluated through measurements. It demonstrates that electromagnetic simulation results are in good agreement with theoretical prediction and measurement results. The three-port power divider is compact in the planar form, so it can be easily integrated into radio frequency front ends.

  • 33.
    Östh, Joakim
    et al.
    Linköping University, Department of Science and Technology, Physics and Electronics. Linköping University, The Institute of Technology.
    Karlsson, Magnus
    Linköping University, Department of Science and Technology, Physics and Electronics. Linköping University, The Institute of Technology.
    Owais, Owais
    Linköping University, Department of Science and Technology, Physics and Electronics. Linköping University, The Institute of Technology.
    Serban, Adriana
    Linköping University, Department of Science and Technology, Physics and Electronics. Linköping University, The Institute of Technology.
    Gong, Shaofang
    Linköping University, Department of Science and Technology, Physics and Electronics. Linköping University, The Institute of Technology.
    Baseband complexity comparison of six-, five-, and four-port receivers2012In: Microwave and optical technology letters (Print), ISSN 0895-2477, E-ISSN 1098-2760, Vol. 54, no 6, p. 1502-1506Article in journal (Refereed)
    Abstract [en]

    The use of six-port correlators to implement six-port receivers has been intensively studied. The six-port receiver can also be modified to a five-port or a four-port receiver. However, the six-, five-, or four-port receiver solution requires different baseband processing to recover the baseband In-phase (I) and Quadrature-phase (Q) data. A unified mathematical model for the six-, five- and four-port receivers is presented in this article. Possible solutions to recover the baseband data are discussed and compared. The investigation shows that the six-port receiver has advantages over the five- and four-port receivers in terms of complexity when analog baseband processing is used. Simulations are conducted to verify the model and to estimate the error vector magnitude versus frequency; the simulation also shows that the six-port receiver operates over a wider bandwidth than the five- or four-port receiver.

  • 34.
    Östh, Joakim
    et al.
    Linköping University, Department of Science and Technology, Physics and Electronics. Linköping University, The Institute of Technology.
    Karlsson, Magnus
    Linköping University, Department of Science and Technology, Physics and Electronics. Linköping University, The Institute of Technology.
    Serban, Adriana
    Linköping University, Department of Science and Technology, Physics and Electronics. Linköping University, The Institute of Technology.
    Gong, Shaofang
    Linköping University, Department of Science and Technology, Physics and Electronics. Linköping University, The Institute of Technology.
    A Comparative Study of Single-Ended vs. Differential Six-Port Modulators for Wireless Communications2015In: IEEE Transactions on Circuits and Systems Part 1: Regular Papers, ISSN 1549-8328, E-ISSN 1558-0806, Vol. 62, no 2, p. 564-570Article in journal (Refereed)
    Abstract [en]

    If present, nonlinear effects in a six-port modulator cause distortion and degradation of the quality of the modulated output waveform. How nonlinear effects occur and their impact on system performance were derived in a mathematical model. The model shows that non-ideal performance of the passive six-port correlator is the main contributor to nonlinear distortion. Simulations and measurements on two manufactured six-port modulators were used to validate the theory and to give deeper insight on system performance. It is shown that by using a differentially signaled six-port modulator instead of a single-ended six-port modulator, better performance is achieved over a wide bandwidth. For an error vector magnitude of less than 10%, the relative bandwidth was measured to 12% for the single-ended but 30% for the differentially signaled modulator

  • 35.
    Östh, Joakim
    et al.
    Linköping University, Department of Science and Technology, Physics and Electronics. Linköping University, The Institute of Technology.
    Karlsson, Magnus
    Linköping University, Department of Science and Technology, Physics and Electronics. Linköping University, The Institute of Technology.
    Serban, Adriana
    Linköping University, Department of Science and Technology, Physics and Electronics. Linköping University, The Institute of Technology.
    Gong, Shaofang
    Linköping University, Department of Science and Technology, Physics and Electronics. Linköping University, The Institute of Technology.
    Carrier Leakage Suppression and EVM Dependence on Phase Shifting Network in Six-Port Modulator2012Conference paper (Refereed)
    Abstract [en]

    In six-port modulators a phase shifting network on specific ports can be used to suppress the carrier leakage that may be present if this network is not present. A model is derived to predict the carrier leakage suppression and error vector magnitude (EVM) as a function of the phase shifting network Sparameters. Both carrier leakage suppression and EVM can be expressed by the same error function. The error function can be used to find the allowed amplitude and phase mismatch in the phase shifting network, or to optimize the performance of a phase shifting network over a given frequency range. A broadband phase shifting network, based on a loaded transmission line, is designed and optimized to operate at a relative bandwidth of 60% for an EVM < 10%. This should be compared to a phase shifting network based on a single transmission line with a corresponding bandwidth of only 12%. The broadband phase shifting network is useful for six-port modulators with carrier leakage suppression, targeting UWB applications.

  • 36.
    Östh, Joakim
    et al.
    Linköping University, Department of Science and Technology, Physics and Electronics. Linköping University, The Institute of Technology.
    Karlsson, Magnus
    Linköping University, Department of Science and Technology, Physics and Electronics. Linköping University, The Institute of Technology.
    Serban, Adriana
    Linköping University, Department of Science and Technology, Physics and Electronics. Linköping University, The Institute of Technology.
    Gong, Shaofang
    Linköping University, Department of Science and Technology, Physics and Electronics. Linköping University, The Institute of Technology.
    M-QAM Six-Port Modulator Using Only Binary Baseband Data, Electrical or Optical2013In: IEEE transactions on microwave theory and techniques, ISSN 0018-9480, E-ISSN 1557-9670, Vol. 61, no 6, p. 2506-2513Article in journal (Refereed)
    Abstract [en]

    A new circuit architecture for a direct-carrier six-port modulator is proposed. The proposed architecture uses parallel binary-valued baseband signals to control binary-valued impedance loads for generation of rectangular M-QAM modulation. A theoretical model of the proposed modulator is also derived. A prototype modulator for 64 quadrature amplitude modulation is designed and fabricated for a center frequency of 2.5 GHz for verification of the proposed architecture. The measurements verify the theory and show that good performance can be obtained with the proposed architecture. The proposed modulator does not require any digital-to-analog converter and can operate with both electrical and optical control signals.

  • 37.
    Östh, Joakim
    et al.
    Linköping University, Department of Science and Technology, Physics and Electronics. Linköping University, The Institute of Technology.
    Owais, Owais
    Linköping University, Department of Science and Technology, Physics and Electronics. Linköping University, The Institute of Technology.
    Karlsson, Magnus
    Linköping University, Department of Science and Technology, Physics and Electronics. Linköping University, The Institute of Technology.
    Serban, Adriana
    Linköping University, Department of Science and Technology, Physics and Electronics. Linköping University, The Institute of Technology.
    Gong, Shaofang
    Linköping University, Department of Science and Technology, Physics and Electronics. Linköping University, The Institute of Technology.
    Performance Evaluation of Six-Port Receivers with Simplified Interface to Amplifier and Filter2011Conference paper (Refereed)
    Abstract [en]

    In six-port modulators a phase shifting network on specific ports can be used to suppress the carrier leakage that may be present if this network is not present. A model is derived to predict the carrier leakage suppression and error vector magnitude (EVM) as a function of the phase shifting network Sparameters. Both carrier leakage suppression and EVM can be expressed by the same error function. The error function can be used to find the allowed amplitude and phase mismatch in the phase shifting network, or to optimize the performance of a phase shifting network over a given frequency range. A broadband phase shifting network, based on a loaded transmission line, is designed and optimized to operate at a relative bandwidth of 60% for an EVM < 10%. This should be compared to a phase shifting network based on a single transmission line with a corresponding bandwidth of only 12%. The broadband phase shifting network is useful for six-port modulators with carrier leakage suppression, targeting UWB applications.

  • 38.
    Östh, Joakim
    et al.
    Linköping University, Department of Science and Technology, Physics and Electronics. Linköping University, The Institute of Technology.
    Owais, Owais
    Linköping University, Department of Science and Technology, Physics and Electronics. Linköping University, The Institute of Technology.
    Karlsson, Magnus
    Linköping University, Department of Science and Technology, Physics and Electronics. Linköping University, The Institute of Technology.
    Serban, Adriana
    Linköping University, Department of Science and Technology, Physics and Electronics. Linköping University, The Institute of Technology.
    Gong, Shaofang
    Linköping University, Department of Science and Technology, Physics and Electronics. Linköping University, The Institute of Technology.
    Schottky diode as high-speed variable impedance load in six-port modulators2011In: ICUWB 2011: 2011 IEEE International Conference on Ultra-Wideband (ICUWB), 2011, p. 68-71Conference paper (Refereed)
    Abstract [en]

    The use of Schottky diodes as high-speed variable impedance loads in six-port modulators are proposed and analyzed in this paper. The impedance dependency of diode parameters and local oscillator power are investigated by theoretical analysis and simulations. A prototype for a direct carrier six-port modulator using Schottky diodes for impedance generation is designed and fabricated for a center frequency of 7.5 GHz. Measurements show good modulation properties when a 16 quadrature amplitude modulation signal at 300 Msymbol/s is generated, i.e., at a data rate of 1.2 Gbit/s, validating the use of Schottky diodes as high-speed variable impedance loads in six-port modulators.

  • 39.
    Östh, Joakim
    et al.
    Linköping University, Department of Science and Technology, Physics and Electronics. Linköping University, The Institute of Technology.
    Owais, Owais
    Linköping University, Department of Science and Technology, Physics and Electronics. Linköping University, The Institute of Technology.
    Karlsson, Magnus
    Linköping University, Department of Science and Technology, Physics and Electronics. Linköping University, The Institute of Technology.
    Serban, Adriana
    Linköping University, Department of Science and Technology, Physics and Electronics. Linköping University, The Institute of Technology.
    Gong, Shaofang
    Linköping University, Department of Science and Technology, Physics and Electronics. Linköping University, The Institute of Technology.
    Karlsson, Peter
    Sony Ericsson Mobile Communication AB.
    Direct Carrier Six-Port Modulator Using a Technique to Suppress Carrier Leakage2011In: IEEE transactions on microwave theory and techniques, ISSN 0018-9480, E-ISSN 1557-9670, Vol. 59, no 3, p. 741-747Article in journal (Refereed)
    Abstract [en]

    This paper presents a direct carrier six-port modulator. To allow arbitrary load impedances to be used and for suppression of carrier leakage, a new circuit architecture with a technique to suppress carrier leakage is proposed and implemented. A theoretical model of the proposed modulator is derived. A prototype modulator utilizing diodes for impedance generation is designed and fabricated for a center frequency of 7.5 GHz for verification of the proposed technique. Measurements show good modulation properties when a 16 quadrature amplitude modulation signal at 100 Msymbol/s is generated, as well as good carrier leakage suppression.

  • 40.
    Östh, Joakim
    et al.
    Linköping University, Department of Science and Technology, Physics and Electronics. Linköping University, The Institute of Technology.
    Serban, Adriana
    Linköping University, Department of Science and Technology, Physics and Electronics. Linköping University, The Institute of Technology.
    Karlsson, Magnus
    Linköping University, Department of Science and Technology, Physics and Electronics. Linköping University, The Institute of Technology.
    Gong, Shaofang
    Linköping University, Department of Science and Technology, Physics and Electronics. Linköping University, The Institute of Technology.
    LO Leakage in Six-Port Modulators and Demodulators and its Suppression Techniques2012Conference paper (Refereed)
    Abstract [en]

    In a six-port demodulator utilizing diodes for power detection, impedance mismatch at the interface between the six-port correlator and diodes generates unwanted local oscillator (LO) leakage to the radio frequency (RF) port. A six-port modulator that uses variable reflection coefficients at specific ports to generate a modulated RF may also suffer from LO leakage if there is a static part in the reflection coefficient. It is known that LO leakage to the RF port not only generates unwanted emission of the LO signal, but also degrades the receiver system performance due to a dynamic dc offset and second-order non-linearity at the detected baseband signal. How this LO leakage appears to the RF port in six-port demodulators and modulators are analyzed. Two different approaches to suppress the LO leakage is then discussed: a) diode impedance matching and b) introduction of a λ/4 line on specific ports. The performance when λ/4 lines are used on specific ports is verified by measurement for both a demodulator and a modulator. The measurement shows high suppression of the LO leakage.

  • 41.
    Östh, Joakim
    et al.
    Linköping University, Department of Science and Technology, Physics and Electronics. Linköping University, The Institute of Technology.
    Serban, Adriana
    Linköping University, Department of Science and Technology, Physics and Electronics. Linköping University, The Institute of Technology.
    Owais, Owais
    Linköping University, Department of Science and Technology, Physics and Electronics. Linköping University, The Institute of Technology.
    Karlsson, Magnus
    Linköping University, Department of Science and Technology, Physics and Electronics. Linköping University, The Institute of Technology.
    Gong, Shaofang
    Linköping University, Department of Science and Technology, Physics and Electronics. Linköping University, The Institute of Technology.
    Data and Carrier Interleaving in Six-Port Receivers for Increased Data Rate2010In: 2010 IEEE International Conferenceon Ultra-Wideband (ICUWB2010: Proceedings - Volume 1, 2010, p. 1-4Conference paper (Refereed)
    Abstract [en]

    This paper proposes how antenna polarization can be utilized to increase the maximum data rate in a multiple six-port receiver system. By utilizing data and carrier interleaving, the total information bandwidth increases and therefore the maximum data rate. Prototype antennas were manufactured and the measured results were later used in a simulation model with three channels for verification of the concept.

  • 42.
    Östh, Joakim
    et al.
    Linköping University, Department of Science and Technology, Physics and Electronics. Linköping University, The Institute of Technology.
    Serban, Adriana
    Linköping University, Department of Science and Technology, Physics and Electronics. Linköping University, The Institute of Technology.
    Owais, Owais
    Linköping University, Department of Science and Technology, Physics and Electronics. Linköping University, The Institute of Technology.
    Karlsson, Magnus
    Linköping University, Department of Science and Technology, Physics and Electronics. Linköping University, The Institute of Technology.
    Gong, Shaofang
    Linköping University, Department of Science and Technology, Physics and Electronics. Linköping University, The Institute of Technology.
    Haartsen, Jaap
    Sony Ericsson Mobile Communications AB, Lund, Sweden.
    Karlsson, Peter
    Sony Ericsson Mobile Communications AB, Lund, Sweden.
    Diode Configurations in Six-Port Receivers with Simplified Interface to Amplifier and Filter2010In: 2010 IEEE International Conferenceon Ultra-Wideband (ICUWB2010): Proceedings – Volume 1, Piscataway, NJ, USA: IEEE , 2010, p. 1-4Conference paper (Refereed)
    Abstract [en]

    This paper presents two new diode configurations for use with six-port based demodulators. The first proposed diode configuration allows a simplified diode to filter/amplifier interface. The second configuration allows for full-wave rectification and suppression of odd-order harmonics. A demodulator prototype utilizing the new diode concept is designed for a center frequency of 7.5 GHz and with a bandwidth of 1 GHz for verification. The demodulator includes the six-port correlator, diodes and amplifiers needed to recover the baseband data.

  • 43.
    Östh, Joakim
    et al.
    Linköping University, Department of Science and Technology, Physics and Electronics. Linköping University, The Institute of Technology.
    Serban, Adriana
    Linköping University, Department of Science and Technology, Physics and Electronics. Linköping University, The Institute of Technology.
    Owais, Owais
    Linköping University, Department of Science and Technology, Physics and Electronics. Linköping University, The Institute of Technology.
    Karlsson, Magnus
    Linköping University, Department of Science and Technology, Physics and Electronics. Linköping University, The Institute of Technology.
    Gong, Shaofang
    Linköping University, Department of Science and Technology, Physics and Electronics. Linköping University, The Institute of Technology.
    Haartsen, Jaap
    Sony Ericsson Mobile Commun AB.
    Karlsson, Peter
    Sony Ericsson Mobile Commun AB.
    Six-Port Gigabit Demodulator2011In: IEEE transactions on microwave theory and techniques, ISSN 0018-9480, E-ISSN 1557-9670, Vol. 59, no 1, p. 125-131Article in journal (Refereed)
    Abstract [en]

    This paper presents measurement results for a six-port-based demodulator designed for a center frequency of 7.5 GHz and with a bandwidth of 1 GHz for operation in the ultra-wideband band. The demodulator includes the six-port correlator, diodes, and amplifiers needed to recover the baseband data. Measurement results show that the prototype supports data rates at 1.7 Gbit/s with bit-error rate 5 . 10(-5) if a two-tap linear equalizer is used and bit-error rate 4 . 10(-3) if only threshold detection is used. The measured performance of the used six-port correlator including the amplifiers is presented and their influence on the overall system performance is discussed. Limitations in the present system and possible improvements are also considered.

1 - 43 of 43
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