An operational amplifier (op-amp) is a DC-coupled high-gain electronic voltage amplifier with a differential input and, usually, a single-ended output. Op-amps are among the most widely used electronic devices today. They are commonly used for amplification, filtering, and signal conditioning in a wide range of applications, including audio equipment, instrumentation, and control systems. They are designed to ideally have infinite open-loop gain, infinite input impedance, and zero output impedance.
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