A wideband cmos cascaded variable gain amplifier using unequally distributed gain control for DVB-S.2 receiver

Hyeonseok Hwang, Hoonki Kim, Chan Hui Jeong, Chan Keun Kwon, Sanggeun Jeon, Soo Won Kim, Yoosam Na, Hyunhwan Yoo

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1 Citation (Scopus)


A fully integrated three stage cascaded radio frequency variable gain amplifier (RFVGA) linearly controlled by exponential current generation circuit is presented. The gain control is unequally distributed in each stage for noise figure (NF) and linearity performance. The dB-linear gain control is realized using pseudo exponential current generated by CMOS current summing circuit with a voltage to current converter. The RFVGA has over 50 dB dynamic range. Gain changes from-38.5 to 16.8 dB according to control voltage that varies from 0.5 to 1.8 V. It operates at 0.95-2.15 GHz. This design is implemented in 0.18 μm CMOS technology.

Original languageEnglish
Article number1340008
JournalJournal of Circuits, Systems and Computers
Issue number9
Publication statusPublished - 2013 Oct 1



  • CMOS
  • DVB-S.2
  • dB-linear
  • gain control
  • triple-well
  • variable gain amplifier (VGA)

ASJC Scopus subject areas

  • Hardware and Architecture
  • Electrical and Electronic Engineering

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