Push-pull-type amplifier circuit.

摘要

A push-pull-type amplifier circuit has three current mirror circuits CM1, CM2, CM3 and transistors M6, M7 connected between a reference current supply IR and output transistors M2, M3 for controlling an idling current flowing through the output transistors M2, M3 so as to be proportional to a current flowing through the reference current supply IR so that the idling current will be stabilized irrespective of variations in a power supply voltage. An operational amplifier which incorporates the push-pull-type amplifier circuit as an output stage circuit is highly stable in operation, and can be designed in a simple arrangement without having to take into account power supply voltage variations. <IMAGE>