A novel method to design variable gain amplifier

Abstract

A novel method to design of Variable gain Amplifiers (VGAs) is proposed. A low power VGA with wide range of gain variation and appropriate bandwidth using new technique is presented in this paper. Moreover, the suggested circuit is simulated in whole process corners and different temperatures in the region of -50 to +70 ºC. The circuit has been designed in a typical 0.35μm CMOS process with a power supply of 3.3V, and simulated by HSPICE software using level 49 parameters (BSIM3v3).

Keywords: variable gain amplifier; Operational Transconductance Amplifier; wide gain range; low power; unity gain bandwidth