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A Tuned, Inductorless, Recursive Filter LNA in CMOS
Linköping University, Department of Electrical Engineering, Electronic Devices. Linköping University, The Institute of Technology.
Linköping University, Department of Electrical Engineering, Electronic Devices. Linköping University, The Institute of Technology.
Linköping University, Department of Electrical Engineering, Electronic Devices. Linköping University, The Institute of Technology.
2002 (English)In: Proceedings of the European Solid-State Circuit Conference (ESSCIRC), Florens, Italy, September, 2002, 351-354 p.Conference paper, Published paper (Refereed)
Abstract [en]

An active recursive filter approach is proposed for the implementation of an inductorless, tuned LNA in CMOS. Such an LNA was designed and fabricated ina 0.8 μm CMOS process. In simulation, the feasibility of this type of LNA was demonstrated, and reasonably good performance was obtained. The fabricated device shows a center frequency tuning range from 250 MHz to 975 MHz. Gain and Q value are tunable in a wide range. The LNA exhibits an input referred 1 dB compression point of -31 dB m and a noise figure of approximately 3 dB measured at 900 MHz center frequency.

Place, publisher, year, edition, pages
2002. 351-354 p.
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:liu:diva-14084OAI: oai:DiVA.org:liu-14084DiVA: diva2:22596
Conference
28th European Solid-State Circuit Conference (ESSCIRC). Firenze, Italy, September 24-26, 2002.
Available from: 2006-10-16 Created: 2006-10-16 Last updated: 2013-10-31
In thesis
1. Multiband LNA Design and RF-Sampling Front-Ends for Flexible Wireless Receivers
Open this publication in new window or tab >>Multiband LNA Design and RF-Sampling Front-Ends for Flexible Wireless Receivers
2006 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

The wireless market is developing very fast today with a steadily increasing number of users all around the world. An increasing number of users and the constant need for higher and higher data rates have led to an increasing number of emerging wireless communication standards. As a result there is a huge demand for flexible and low-cost radio architectures for portable applications. Moving towards multistandard radio, a high level of integration becomes a necessity and can only be accomplished by new improved radio architectures and full utilization of technology scaling. Modern nanometer CMOS technologies have the required performance for making high-performance RF circuits together with advanced digital signal processing. This is necessary for the development of low-cost highly integrated multistandard radios. The ultimate solution for the future is a software-defined radio, where a single hardware is used that can be reconfigured by software to handle any standard. Direct analog-to-digital conversion could be used for that purpose, but is not yet feasible due to the extremely tough requirements that put on the analog-to-digital converter (ADC). Meanwhile, the goal is to create radios that are as flexible as possible with today’s technology. The key to success is to have an RF front-end architecture that is flexible enough without putting too tough requirements on the ADC.

One of the key components in such a radio front-end is a multiband multistandard low-noise amplifier (LNA). The LNA must be capable of handling several carrier frequencies within a large bandwidth. Therefore it is not possible to optimize the circuit performance for just one frequency band as can be done for a single application LNA. Two different circuit topologies that are suitable for multiband multistandard LNAs have been investigated, implemented, and measured. Those two LNA topologies are: (i) wideband LNAs that cover all the frequency bands of interest (ii) tunable narrowband LNAs that are tunable over a wide range of frequency bands.

Before analog-to-digital conversion the RF signal has to be downconverted to a frequency manageable by the analog-to-digital converter. Recently the concept of direct sampling of the RF signal and discrete-time signal processing before analog-to-digital conversion has drawn a lot of attention. Today’s CMOS technologies demonstrate very high speeds, making the RF-sampling technique appealing in a context of multistandard operation at GHz frequencies. In this thesis the concept of RF sampling and decimation is used to implement a flexible RF front-end, where the RF signal is sampled and downconverted to baseband frequency. A discrete-time switched-capacitor filter is used for filtering and decimation in order to decrease the sample rate from a value close to the carrier frequency to a value suitable for analog-to-digital conversion. To demonstrate the feasibility of this approach an RF-sampling front-end primarily intended for WLAN has been implemented in a 0.13 μm CMOS process.

Place, publisher, year, edition, pages
Linköping: Linköping University Electronic Press, 2006. 234 p.
Series
Linköping Studies in Science and Technology. Dissertations, ISSN 0345-7524 ; 1036
Keyword
RF, Microelectronics, Multiband LNAs, RF-Sampling, Sampling Front-Ends, Flexible Wireless Receivers, Multistandard Receivers.
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:liu:diva-7582 (URN)91-85523-22-4 (ISBN)
Public defence
2006-10-27, Visionen, Hus B, Campus Valla, Linköpings universitet, Linköping, 10:15 (English)
Opponent
Supervisors
Available from: 2006-10-16 Created: 2006-10-16 Last updated: 2012-01-30Bibliographically approved
2. New directions in RF LNA design
Open this publication in new window or tab >>New directions in RF LNA design
2004 (English)Licentiate thesis, comprehensive summary (Other academic)
Abstract [en]

The RF field develops fast today and to meet the increasing needs from more and more users and higher and higher data rates for mobile terminals the number of wireless standards are rapidly increasing. This has lead to an increased number of frequency spectra dedicated for wireless communication, such as the recent ones for WCDMA, Bluetooth, and WLAN. Instead of using one RF front-end for each standard as done today, the need for multiband multistandard front-end receiver architectures will be large in the near future. This is a big step towards software defined radio. This single front-end approach will lead to more flexible receivers to a lower cost for the consumers. Multiband multistandard receivers need circuitry that can adapt to several RF-bands with very varying carrier frequencies and different requirements. For cost effectiveness there should also be a minimum of external components and on-chip passives.

One of the most critical components in a multiband multistandard receiver, independent of the receiver architecture, is the low-noise amplifier (LNA). The LNA must be capable of handling several carrier frequencies within a large bandwidth. Therefore it is not possible to optimize the circuit performance for just one frequency band as can be done for a single application LNA. This makes the design task more difficult. Two different circuit topologies that are suitable for multi band multistandard LNAs are:

• Wideband LNAs that cover the frequency bands of interest

• Tunable narrowband LNAs, tunable over the frequency bands of interest

The main focus of the research has been to develop suitable circuit techniques for such LNAs in silicon technologies (CMOS and BiCMOS) in the frequency range 1-10 GHz with a minimum of passives. Both wideband LNAs and tunable narrowband LNAs based on the principle of active recursive filters have been implemented in both CMOS and BiCMOS technologies.

Place, publisher, year, edition, pages
Linköping: Linköpings universitet, 2004. 36 p.
Series
Linköping Studies in Science and Technology. Thesis, ISSN 0280-7971 ; 1101
National Category
Engineering and Technology
Identifiers
urn:nbn:se:liu:diva-22629 (URN)1911 (Local ID)91-7373-984-7 (ISBN)1911 (Archive number)1911 (OAI)
Presentation
2004-06-15, Glashuset, Linköpings universitet, Linköping, 13:15 (Swedish)
Opponent
Available from: 2009-10-07 Created: 2009-10-07 Last updated: 2014-05-27

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Andersson, StefanCaputa, PeterSvensson, Christer

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