Patent ID: 6163217
Filing Date: 2000-12-19
Classification: H03F

Abstract:
An operational amplifier comprising:a differential amplifier circuit which executes differential amplification to a first input signal and a second input signal and outputs a first output signal and a second output signal;an output circuit consisting of a first MOS transistor and a second MOS transistor each constituting a complimentary circuit, a first phase-compensating capacitor for executing phase compensation in said first MOS transistor, and a second phase-compensating capacitor for executing phase compensation in said second MOS transistor, said output circuit amplifies and outputs a output signal from said differential amplifier circuit;a level shift circuit which supplies a potential level corresponding to the first output signal of said differential amplifier circuit to the gate of said first MOS transistor and controls a current charged into or discharged from said first phase-compensating capacitor; anda current correcting circuit which corrects a potential level corresponding to the second output signal from said differential amplifier circuit to the gate of said second MOS transistor and corrects a current charged into or discharged from said second phase-compensating capacitor so that the current is equal to a current charged into or discharged from said first phase-compensating capacitor.