Miller Compensated Op-Amp Design for High PSRR & High Gain of 72dB in 180-nm CMOS Process

Design of two stage Complementry Metal Oxide Semiconductor Operational amplifier has presented in this work, where the OpAmp is designed on T-SPICE with the help of 180 nm technology, also with miller compensation technique for large gain and PSRR. On incorporating the components of external feedback deployment, the op-amp can be utilized for a many applications e.g. in amplifications in ac & dc signals, oscillators, filters, regulators, comparators & other circuits. In this work, emphasis is given for achieving product of a large gain & also higher gain bandwidth. Work has been for obtaining a higher stability value in terms of Phase Margin & less dissipating power. Number of simulations had been presented for testing the targeted parameters, confirming a 72 dB gain with 51 MHz GBW. The phase margin of 57° have attained along with a slew rate value of 24 V/μs. The design & various simulations had carried out for validating the performance of power dissipation having value 290 μW & value of PSRR as 94.66 dB. With all results, the proposed Op-Amp provides a good use in comparator & other data converting services.