Design techniques for cascoded CMOS op amps with improved PSRR and common-mode input range
Buffer circuits CMOS integrated circuits Internally compensated CMOS op amps have been widely used in sampled-analog signal processing applications over the past several years. However Linear integrated circuits Operational amplifiers design guidelines are suggested and test results are presented. the other for buffer applications requiring wide common-mode input range. Small signal analysis is developed for the open-loop and PSRR responses of the two amplifiers. In addition the popular two-stage op amp suffers from poor AC power supply rejection to one of the power rails. Two circuits are presented that overcome the power-supply rejection ratio (PSRR) problems of the earlier amplifier: one for virtual ground applications such as switched-capacitor integrators