A high performance CMOS two-stage operational amplifier with high open loop, high PSRR and nested Miller frequency compensation is presented on the basis of the analysis of traditional circuits. With the normal loads, an open-loop gain (A/sub v/) of 87dB, a unity gain bandwidth (GB) of 12MHz, a phase margin ( O ) of 63/spl deg/, and a power supply rejection ratio (PSRR) 72.6dB have been achieved for a V/sub DD/ of 3V.