The given equivalent circuit belongs to:

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DFCCIL Executive S&T 29 Sept 2021 Official Paper

Answer 1

Varactor diode is commonly used for Electronic tuning.

F1 Neha Madhuri 20.11.2021 D6

Varactor diode:

It is represented by a symbol of diode terminated in the variable capacitor as shown below:

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Varactor diode refers to the variable Capacitor diode, which means the capacitance of the diode varies linearly with the applied voltage when it is reversed biased.
The junction capacitance across a reverse bias pn junction is given by

\(C=\frac{A\epsilon}{W}\)

As the reverse bias voltage increases, the depletion region width increases resulting in a decrease in the junction capacitance.

Varactor diodes are used in electronic tuning systems to eliminate the need for moving parts
Varactor [also called varicap, variable reactance diode, or tuning diode] diodes are the semiconductor, voltage-dependent, variable capacitors
Varactors are used as voltage-controlled capacitors and it operated in a reverse-biased state

Important Points