A 90 dB 1.32 mW 1.2 v 0.13 mm(2) two-stage variable gain amplifier in 0.18 mu m CMOS

Abstract

An all CMOS variable gain amplifier (VGA) which features wide dB-linear gain range per stage (45 dB), low power consumption (1.32 row), small chip size (0.13 mm(2)), and low supply voltage (1.2 V) is described. The dB-linear range is extended by reducing the supply voltage of the conventional V-to-I converter. The two-stage VGA implemented in 0.18 mu m CMOS offers 90 dB of gain variation, 3 dB bandwidth of greater than 21 MHz, and max/min input IP3 and P1 dB, respectively, of -5/-42 and -12/-50 dBm.