Operational Amplifier (Op-amp) What is an Operational Amplifier (Op-amp)? An operational amplifier is an integrated circuit that can amplify weak electric signals. An operational amplifier has two input pins and one output pin. Its basic role is to amplify and output the voltage difference between the two input pins. An operational amplifier (op amp) is an analog circuit block that takes a differential voltage input and produces a single-ended voltage output. Pin configuration V+: non-inverting input V−: inverting input Vout: output VS+: positive power supply VS−: negative power supply Operational Amplifier Clasifications There are four ways to classify operational amplifiers: Voltage amplifiers take voltage in and produce a voltage at the output. Current amplifiers receive a current input and produce a current output. Transconductance amplifiers convert a voltage input to a current output. Transresistance amplifiers convert a current input and produces a voltage output. Op-amp cha