operational amplifiern.
/ˌɒpəˈreɪʃn̩(ə)l ˈamplᵻfʌɪə/, /ˌɒpəˈreɪʃən(ə)l ˈamplᵻfʌɪə/, U.S. /ˌɑpəˈreɪʃən(ə)l ˈæmpləˌfaɪər/, /ˌɑpəˈreɪʃn(ə)l ˈæmpləˌfaɪər/ Electronics.
An amplifier with a very high open-loop gain and a very low output impedance that is used (usually with external feedback) esp. in circuits for performing a particular mathematical operation on an input voltage with high accuracy. Also called op-amp.The relation of output to input is effectively determined solely by the arrangement and magnitude of the other, passive, circuit elements.
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the world > matter > physics > electromagnetic radiation > electronics > electronic devices or components > [noun] > amplifier
amplifier1914
superregenerator1922
operational amplifier1947
op-amp1967
1947 J. R. Ragazzini et al. in Proc. IRE 35 444/2 As an amplifier so connected can perform the mathematical operations of arithmetic and calculus on the voltages applied to its input, it is hereafter termed an ‘operational amplifier’.
1972 B. H. Vassos & G. W. Ewing Analog & Digital Electronics for Scientists v. 139 Deviations from ideality in operational amplifiers are very often negligible.
1995 Oxf. Univ. Gaz. 15 June 1282/2 Ideal operational amplifiers and their use with negative feedback in linear amplifiers, integrators, differentiators, and summing circuits.
This entry has been updated (OED Third Edition, June 2004; most recently modified version published online March 2022).
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n.1947