| Popis: |
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 /spl mu/m CMOS technology, which is suitable to the use in IF amplifier in modern wireless communication systems. |
