RF Variable-Gain Amplifiers and AGC Loops for Digital TV Receivers

Kunihiko IIZUKA
Masato KOUTANI
Takeshi MITSUNAKA
Hiroshi KAWAMURA
Shinji TOYOYAMA
Masayuki MIYAMOTO
Akira MATSUZAWA

Publication
IEICE TRANSACTIONS on Electronics   Vol.E91-C    No.6    pp.854-861
Publication Date: 2008/06/01
Online ISSN: 1745-1353
DOI: 10.1093/ietele/e91-c.6.854
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Special Section on Analog Circuits and Related SoC Integration Technologies)
Category: 
Keyword: 
VGA,  AGC,  SiGe BiCMOS,  CMOS,  tuner,  IIP3,  linearity,  

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Summary: 
RF Variable Gain Amplifiers (RF-VGA) are important components for integrated TV broadcast receivers. Analog and digital controlled RF-VGAs are compared in terms of linearity and an AGC loop architecture suitable for digitally controlled RF-VGA is proposed. Further linearity enhancement applicable for CMOS implementation is also discussed.