Title :
An all CMOS 84dB-linear low-power variable gain amplifier
Author :
Duong, Quoc-Hoang ; Le-Quan ; Lee, Sang-Gug
Author_Institution :
Inf. & Commun. Univ., Daejeon, South Korea
Abstract :
A new exponential approximation function is implemented into a variable gain amplifier (VGA). The newly proposed VGA topology provides low-power, small chip size, and wide control gain range. The VGA is fabricated in 0.18μm CMOS technology and measurements show a gain variation of more than 84dB in two cascaded stages, and 80dB-linear range with a linearity error of less than ±1dB. The PldB varies from -42dBm to -22dBm. The power dissipation is less than 3.6mA from 1.8V supply. The chip excluding bondpads occupies 0.4mm2.
Keywords :
CMOS integrated circuits; amplifiers; network topology; 0.18 micron; 1.8 V; CMOS technology; VGA topology; automatic gain control; chip size; exponential approximation function; gain variation; linearity error; power dissipation; variable gain amplifier; CMOS technology; Circuits; Dynamic range; Gain control; Linearity; Medical control systems; Power dissipation; Taylor series; Telecommunication control; Topology;
Conference_Titel :
VLSI Circuits, 2005. Digest of Technical Papers. 2005 Symposium on
Print_ISBN :
4-900784-01-X
DOI :
10.1109/VLSIC.2005.1469346
