Low-power process-insensitive operational amplifier design

Abstract

A low-power process-insensitive buffered operational amplifier (Opamp) is presented. Current reference circuit of the Opamp is designed by a process invariant current source to achieve better tolerance to process variations without degrading other performance parameters. Simulation results are obtained by using Cadencetools with GPDK 180 nm library and supply voltage of ±0.6 V. The proposed Opamp has shown 42% better process tolerance than the basic CMOS Opamp and it consumes only 54 uW of power, whereas the power consumption is 91 uW for the later.