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IEICE Transactions on Electronics 2008 E91-C(6):854-861; doi:10.1093/ietele/e91-c.6.854
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Copyright © 2008 The Institute of Electronics, Information and Communication Engineers

Special Section on Analog Circuits and Related SoC Integration Technologies - Papers

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

Kunihiko IIZUKA1,2, Masato KOUTANI3, Takeshi MITSUNAKA1, Hiroshi KAWAMURA1, Shinji TOYOYAMA3, Masayuki MIYAMOTO3 and Akira MATSUZAWA2

1 The authors are with SHARP, Tenri-shi, 632-8567 Japan. E-mail: Iizuka.Kunihiko{at}sharp.co.jp, 2 The authors are with Tokyo Institute of Technology, Tokyo, 152-8552 Japan., 3 The authors are with SHARP, Osaka-shi, 545-8522 Japan.


  Abstract

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.

Key Words: VGA, AGC, SiGe BiCMOS, CMOS, tuner, IIP3, linearity

Manuscript received October 12, 2007. Manuscript revised December 21, 2007.


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