An op amp consists of a diff amp as the input stage,followed by more stages of gain,and a class B push-pull emitter follower.

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An operational amplifier (op amp) typically consists of a differential amplifier (diff amp) at the input stage, followed by additional stages of gain to amplify the signal, and often concludes with a class B push-pull emitter follower output stage to drive the load.

An Op Amp Consists of a Diff Amp as the Input