The feedback technology for gain flatness and stability of UWB LNA - 文章详情页

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EI Scopus

摘要：

In　this　paper,　based　on　small　signal　models　of　hetero-junction　bipolar　transistors　(HBTs)　with　different　feedback　circuits,　the　expressions　for　S　parameters　of　the　device　are　derived　to　analyze　the　influence　of　different　feedback　technologies　on　amplifier　performance,　especially　on　the　stability　and　the　gain　flatness　of　Ultra-Wideband　Low　Noise　Amplifier(UWB　LNA).　When　a　serial　inductor　or　a　parallel　capacitor　is　added　into　the　feedback　circuits　to　induce　reactive　feedback,　the　amplitude　of　S21　increases　as　the　frequency　increases,　the　HBT＇s　gain　inherent　decreasing　at　high　frequency　is　compensated,　a　good　stability　performance　can　also　be　reached　simultaneously.　Based　on　reactive　feedback　techniques,　we　design　a　3GHz10GHz　UWB　LNA.　The　simulation　results　show　that　throughout　the　whole　frequency　band,　the　amplifier　remains　unconditionally　stable,　has　a　high　transmission　gain,　good　gain　flatness　and　low　noise　figure.　©　2011　IEEE.

关键词：

High frequency amplifiers Low noise amplifiers Noise figure Feedback Scattering parameters Convergence of numerical methods Ultra-wideband (UWB) Stability Broadband amplifiers Feedback amplifiers

作者机构：

[ 1 ] [Zhang, Donghui]College of Electronic Information and Control Engineering, Beijing University of Technology, Beijing 100124, China
[ 2 ] [Zhang, Wanrong]College of Electronic Information and Control Engineering, Beijing University of Technology, Beijing 100124, China
[ 3 ] [Jin, Dongyue]College of Electronic Information and Control Engineering, Beijing University of Technology, Beijing 100124, China
[ 4 ] [Xie, Hongyun]College of Electronic Information and Control Engineering, Beijing University of Technology, Beijing 100124, China
[ 5 ] [Ding, Chunbao]College of Electronic Information and Control Engineering, Beijing University of Technology, Beijing 100124, China
[ 6 ] [Zhao, Xin]College of Electronic Information and Control Engineering, Beijing University of Technology, Beijing 100124, China
[ 7 ] [Liu, Boyyu]College of Electronic Information and Control Engineering, Beijing University of Technology, Beijing 100124, China
[ 8 ] [Zhou, Yongqiang]College of Electronic Information and Control Engineering, Beijing University of Technology, Beijing 100124, China

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电子邮件地址：

dhzhang@emails.bjut.edu.cn

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