Operational Amplifier (OPAMP) internal structure

An operational amplifier is built from three main internal stages that work together to produce a controlled output. The differential input stage compares the positive and negative input signals and converts their difference into a small current change. The voltage amplifier and level-shifter stage greatly increases this signal while setting the correct DC operating point. Finally, the output stage provides enough current drive to deliver a stable voltage at the output. This layered structure explains how tiny input differences become useful amplified signals in real electronic circuits.

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