A low distortion and fast settling automatic gain control amplifier in CMOS technology

Author

Lin, Chung-Wei ; Liu, Yen-Zen ; Hsu, Klaus Y J

Author_Institution

Inst. of Electron. Eng., National Tsing Hua Univ., Hsin Chu, Taiwan

Volume

1

fYear

2004

fDate

23-26 May 2004

Abstract

This paper presents an automatic gain control (AGC) circuit with the improvement of the harmonic distortion and tracking time in CMOS technology. A configuration, which is comprised of V-V converters and a corner tracker, is proposed to extend the linear-in-dB range of the variable gain amplifier (VGA) and to increase the tolerance of the circuit to process corner variation. A new comparator technique is introduced to speed up the tracking time of the AGC circuit and to reduce the acquisition time of the system. The AGC consumes 8 mA current and has a 100 MHz 3-dB bandwidth in 0.35 μm CMOS technology, which is suitable to the use in IF amplifier in modern wireless communication systems.

Keywords

CMOS integrated circuits; amplifiers; automatic gain control; comparators (circuits); convertors; harmonic distortion; 0.35 micron; 100 MHz; 8 mA; CMOS technology; IF amplifier; V-V converters; acquisition time; automatic gain control amplifier; automatic gain control circuit; circuit tolerance; comparator technique; corner tracker; corner variation; harmonic distortion; linear-in-dB range; low distortion amplifier; tracking time; variable gain amplifier; wireless communication systems; CMOS technology; Capacitors; Circuits; Detectors; Energy consumption; Gain control; Harmonic distortion; Logic; Partial discharges; Signal processing;

fLanguage

English

Publisher

ieee

Conference_Titel

Circuits and Systems, 2004. ISCAS '04. Proceedings of the 2004 International Symposium on

Print_ISBN

0-7803-8251-X

Type

conf

DOI

10.1109/ISCAS.2004.1328251

Filename

1328251