Abstract
This paper presents an automatic gain control (AGC) circuit with the improvement of harmonic distortion and tracking time in CMOS technology. A novel 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 circuit consumes 8mA current and has a 100MHz 3-dB bandwidth in 0.35um CMOS technology, which is suitable to the use in IF amplifier in modern wireless communication systems.