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Amateur Extra: What is a Parametric Amplifier?

Variable Capacitor

Today’s exam question comes from the Amateur Extra exam, Sub-element 7 (Practical Circuits) and Section B, (Amplifiers)…  [E7B20] What is a parametric amplifier? A. A type of bipolar operational amplifier with excellent linearity derived from use of very high voltage on the collector B. A low-noise VHF or UHF amplifier relying on varying reactance for …

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