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parametric amplifier

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noun Electronics.
  1. a device, as an electron tube or transistor, that amplifies a high-frequency input signal by sinusoidally varying the reactance of the circuit.
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Origin of parametric amplifier

First recorded in 1955–60
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
British Dictionary definitions for parametric amplifier

parametric amplifier

noun
  1. a type of high-frequency amplifier in which energy from a pumping oscillator is transferred to the input signal through a circuit with a varying parameter, usually a varying reactance
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Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012