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Low-Noise Amplifier Design for Ultra-Wideband Systems
Linköping University, Department of Science and Technology. Linköping University, The Institute of Technology.ORCID iD: 0000-0003-2117-1178
2006 (English)Licentiate 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.

Place, publisher, year, edition, pages
Linköping: Linköpings universitet , 2006. , 44 p.
Series
Linköping Studies in Science and Technology. Thesis, ISSN 0280-7971 ; 1281
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:liu:diva-44987ISRN: LIU-TEK-LIC:62Local ID: 79038ISBN: 91-85643-48-3 (print)OAI: oai:DiVA.org:liu-44987DiVA: diva2:265849
Available from: 2009-10-10 Created: 2009-10-10 Last updated: 2015-03-18
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, 227-229 p.Conference 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, 291-194 p.Conference 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, 1106-1109 p.Conference 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.

Keyword
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: 2015-03-18Bibliographically 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.

Keyword
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: 2015-03-18

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