In integrated circuits,differences exist between two input voltage signals.Operational amplifiers have the function of amplifying weak differential signals and outputting them,and they are widely used in the processing of analog signals.As the most core functional module,CMOS operational amplifier plays an important role in urban rail transit circuit systems.A CMOS two-stage operational amplifier circuit capable of achieving high output resistance is designed,with the first stage adopting a differential amplifier circuit and the second stage adopting a common-source amplifier circuit and optimized to achieve an open-loop gain of about 78.2 dB,a gain bandwidth of about 5.279 MHz,and a phase margin of about 60.94° through simulation,to improve the computation rate of power control and communication troubleshooting in enhancing the maintenance process of electric buses.
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