What are the applications of Varactor diode?

There are some important applications of varactor diode which are given below,

The varactor diode is used in electronics tuners in radio, television and other commercial receivers.
The varactor diode is used in low noise parametric amplifiers, frequency generators and frequency converters or mixers.
It is used in automatic frequency control device.
It is used in self balancing bridge circuits.
It is used as a voltage variable capacitor.
It is used in adjustable band pass filters.
It is used in variable resonant tank LC circuit. Here C part is varied using varactor diode.

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