What is a varactor diode?

A varactor diode is a diode whose capacitance can be changed by applying a reverse voltage. It is also called variable capacitance diode or varicap. In general, when a reverse voltage is applied to the PN junction of a diode, the depletion layer, which has no carriers such as electrons or holes, behaves like a capacitor. A varactor diode actively utilizes the property that the capacitance acting as a capacitor changes according to the magnitude of the applied voltage.

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