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Ultrawideband Low-Noise Amplifier Design for 3.1-4.8 GHz
Linköping University, Department of Science and Technology. Linköping University, The Institute of Technology.ORCID iD: 0000-0003-2117-1178
Linköping University, Department of Science and Technology. Linköping University, The Institute of Technology.
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. 291-194 p.
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:liu:diva-32377Local ID: 18275OAI: oai:DiVA.org:liu-32377DiVA: diva2:253199
Conference
Gigahertz 2005, Uppsala, Sweden. Nov, 2005.
Available from: 2009-10-09 Created: 2009-10-09 Last updated: 2015-03-18
In thesis
1. Low-Noise Amplifier Design for Ultra-Wideband Systems
Open this publication in new window or tab >>Low-Noise Amplifier Design for Ultra-Wideband Systems
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:nbn:se:liu:diva-44987 (URN)LIU-TEK-LIC:62 (ISRN)79038 (Local ID)91-85643-48-3 (ISBN)79038 (Archive number)79038 (OAI)
Available from: 2009-10-10 Created: 2009-10-10 Last updated: 2015-03-18

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Serban Craciunescu, AdrianaGong, Shaofang

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