A CDE Definition
(OPerational AMPlifier) A type of high-gain differential amplifier that is used in myriad electronic applications from communications to audio and video. Starting with the vacuum tube operational amplifiers of the 1940s, there have been numerous op amp designs. See differential amplifier.
An electronic circuit that amplifies the difference between two voltages. With one regular input and one inverting input (+ becomes -, - becomes +), it multiplies the difference by a constant factor. Differential amplifiers are used in myriad applications, including microphones, simulation, analog-to-digital conversion and automatic gain control. See op amp.
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