Study of feedback technology for gain flatness of UWB LNA - Details

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EI Scopus

Abstract：

The　S　parameter　expression　of　the　HBT　with　multiple　feedbacks,　especial　the　transmission　gain　S21,　is　presented　and　analyzed.　Pure　resistive　feedback　makes　better　input　and　output　matching.　Reactive　feedback　promotes　the　amplitude　of　S21　as　the　frequency　increases,　which　compensates　the　inherent　decrease　of　HBT＇s　gain　in　high　frequency.　The　gain　decrease　induced　by　the　resistive　feedback　is　also　counteracted.　So　the　gain　flatness　is　realized　in　the　frequency　band　from　3.1GHz　to　10.6GHz.　©2009　IEEE.

Keyword：

Low noise amplifiers Scattering parameters Feedback Ultra-wideband (UWB) Feedback amplifiers Broadband amplifiers

Author Community：

[ 1 ] [Xie, Hongyun]College of Electronic Information and Control Engineering, Beijing University of Technology, Beijing, China
[ 2 ] [Zhang, Wanrong]College of Electronic Information and Control Engineering, Beijing University of Technology, Beijing, China
[ 3 ] [Li, Jia]College of Electronic Information and Control Engineering, Beijing University of Technology, Beijing, China
[ 4 ] [Shen, Pei]College of Electronic Information and Control Engineering, Beijing University of Technology, Beijing, China
[ 5 ] [Huang, Yiwen]College of Electronic Information and Control Engineering, Beijing University of Technology, Beijing, China
[ 6 ] [Huang, Lu]College of Electronic Information and Control Engineering, Beijing University of Technology, Beijing, China
[ 7 ] [Hu, Ning]College of Electronic Information and Control Engineering, Beijing University of Technology, Beijing, China