A semiconductor diode with a capacitance dependent on the applied voltage.
- The most significant use of varactors to date has been as the basic component in parametric amplifiers.
- They key to understanding how a varactor or varicap diode works is to look at what a capacitor is and what can change the capacitance.
- This nonlinearity allows the varactor to be used also as a harmonic generator.
1950s: from elements of variable reactor.
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