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
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.
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.
References
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