A 21nW CMOS operational amplifier for biomedical application

Abstract

In this paper, CMOS operational amplifier using a two stage has been enunciated for low power device application by using it in subthreshold region. The proposed op-amp shows high gain as well as moderate UGB using capacitor compensation technique circuit. It is operated on rail to rail power supply of ±500 mV. This amplifier is highly useful for biomedical application due to low power consumption. The designed operational amplifier gain is 48 dB, bandwidth is 29 kHz, phase margin is 61°, and slew rate is 50.6 V/µS with 21 nW power consumption. This circuit is designed and simulated in cadence analog and digital system design tools of UMC 90 nm CMOS technology.