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    Wikipedia
    https://en.wikipedia.org/wiki/Varicap
    Varicap - Wikipedia
    Applications

    Varactors are used as voltage-controlled capacitors. They are commonly used in voltage-controlled oscillators, parametric amplifiers, and frequency multipliers. Voltage-controlled oscillators have many application… See more

    Operation

    Varactors are operated in a reverse-biased state, so no DC current flows through the device. The amount of reverse bias controls the thickness of the depletion zone and therefore the varactor's junction capacitanc… See more

    Use in a circuit

    Generally the use of a varicap diode in a circuit requires connecting it to a tuned circuit, usually in parallel with any existing capacitance or inductance. A DC voltage is applied as reverse bias across the varicap to alter its c… See more

    Harmonic multiplication

    In some applications, such as harmonic multiplication, a large signal amplitude alternating voltage is applied across a varicap to deliberately vary the capacitance at signal rate to generate higher harmonics, which are e… See more

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    Applications
    Operation
    Use in a circuit
    Harmonic multiplication
     
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