A 90dB 1.32mW 1.2V 0.13mm² Two-Stage Variable Gain Amplifier in 0.18μm CMOS

Abstract

An all CMOS variable gain amplifier (VGA) which features wide dB-linear gain range per stage (45dB), low power consumption (1.32mW), small chip size (0.13mm²), and low supply voltage (1.2V) 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 0.18μm CMOS offers 90dB of gain variation, 3dB bandwidth of greater than 21MHz, and max/min input IP3 and P1 dB, respectively, of -5/-42 and -12/-50 dBm.