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CLC number: TN722.3

On-line Access: 2011-07-04

Received: 2010-06-28

Revision Accepted: 2010-11-05

Crosschecked: 2011-05-31

Cited: 1

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Journal of Zhejiang University SCIENCE C 2011 Vol.12 No.7 P.608-613

http://doi.org/10.1631/jzus.C1010300


A gain-flatness optimization solution for feedback technology of wideband low noise amplifiers


Author(s):  Zhen-hua Li, Bang-hong Guo, Zheng-jun Wei, Song-hao Liu, Nan Cheng, Jin-dong Wang, Jian-jun Guo, Long Yan

Affiliation(s):  Key Laboratory of Photonic Information Technology of Guangdong Higher Education Institutes, SIPSE & LQIT, South China Normal University, Guangzhou 510006, China

Corresponding email(s):   weizjweizj@126.com

Key Words:  Low-noise amplifier (LNA), Ultra-wideband, HEMT, Feedback, Gain flatness


Zhen-hua Li, Bang-hong Guo, Zheng-jun Wei, Song-hao Liu, Nan Cheng, Jin-dong Wang, Jian-jun Guo, Long Yan. A gain-flatness optimization solution for feedback technology of wideband low noise amplifiers[J]. Journal of Zhejiang University Science C, 2011, 12(7): 608-613.

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author="Zhen-hua Li, Bang-hong Guo, Zheng-jun Wei, Song-hao Liu, Nan Cheng, Jin-dong Wang, Jian-jun Guo, Long Yan",
journal="Journal of Zhejiang University Science C",
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pages="608-613",
year="2011",
publisher="Zhejiang University Press & Springer",
doi="10.1631/jzus.C1010300"
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%A Bang-hong Guo
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%A Song-hao Liu
%A Nan Cheng
%A Jin-dong Wang
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A1 - Nan Cheng
A1 - Jin-dong Wang
A1 - Jian-jun Guo
A1 - Long Yan
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PB - Zhejiang University Press & Springer
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Abstract: 
The S parameter expression of high-frequency models of the high electron mobility transistors (HEMTs) with basic feedback structure, especially the transmission gain S21, is presented and analyzed. In addition, an improved feedback structure and its theory are proposed and demonstrated, in order to obtain a better gain-flatness through the mutual interaction between the series inductor and the parallel capacitor in the feedback loop. The optimization solution for the feedback amplifier can eliminate the negative impacts on transmission gain S21 caused by things such as resonance peaks. Furthermore, our theory covers the shortage of conventional feedback amplifiers, to some extent. A wideband low-noise amplifier (LNA) with the improved feedback technology is designed based on HEMT. The transmission gain is about 20 dB with the gain variation of 1.2 dB from 100 MHz to 6 GHz. The noise figure is lower than 2.8 dB in the whole band and the amplifier is unconditionally stable.

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