Design of CMOS two-stage operational amplifier for ECG monitoring system using 90nm technology

Abstract

This paper presents a high performance Two-stage operational amplifier for biomedical applications. This Two-stage is designed for low noise, low power, high PSRR and high CMRR. The Miller compensation technique (Cc) is used with a nulling active resistance (Rz) implemented using Transmission gate transistors for stable operation in feedback mode. The operational amplifier was manufactured in a SPECTRE using GPDK 0.90-um CMOS technology with threshold voltages of a 0.17 V and - 0.14 V achieve a low power 2.6uW, high CMRR up to 130dB and PSRR up to 70dB at 1V power supply.