varicap

Also known as variable capacitance diode, varactor, tuning diode, variable reactance diode, varactor diode, varicap diode

A varicap diode, varactor diode, variable capacitance diode, variable reactance diode or tuning diode is a type of diode designed to exploit the voltage-dependent capacitance of a reverse-biased p–n junction.

Key facts

Electronic component.name: Varicap diode
Electronic component.image: Varicap Diodes.jpg
Electronic component.type: Passive
Electronic component.invention_Year: 1961
Electronic component.first_produced: 1967
Electronic component.first_produced_by: TRW Inc.
Electronic component.pins: Anode and cathode
Electronic component.symbol: 150px

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Commons category: Varicaps

Sources (2)

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~10 min read

Article

10 sections

Contents

Applications
Operation
Use in a circuit
Tuning circuits
Harmonic multiplication
Substitutes for varicap diodes
See also
References
Further reading
External links

== 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 applications such as frequency modulation for FM transmitters and phase-locked loops. Phase-locked loops are used for the frequency synthesizers that tune many radios, television sets, and cellular telephones.