Two stage compensated CMOS Op-Amp and its applications (Voltage regulator and Comparator) ABSTRACT This paper describes the designing and simulation of various parameters of-Two stage compensated Op-Amp using with high gain, high PSRR, high CMRR and low power. Circuit is applied to operate at lower supply voltage (5V). Achievement of high gain around 90db, 60 degree phase margin for stable closed loop operations were the goal of primary concern. Simulation had been carried out using Pspice Orcad simulator . 1.Introduction Op-Amp is among today’s most widely used circuit blocks. They can be used to realize summers, integrators, attenuators, comparators, differentiators etc. An Op-amp is a high-gain differential input amplifier. Various characteristics of Op-Amp include high CMRR, high PSRR and a high Slew Rate. Commonly used configuration for CMOS Op-Amp is the two stage amplifier. A differential front end which converts a differential voltage into a current and