The name of a diode that can be used to provide a variable capacitance is:
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Solution
Varactor diode:
A varactor diode is a kind of diode wherein internal capacitance fluctuates with regard to the reversing voltage.
It is indeed a voltage-dependent semiconductor technology that always functions in reverse bias. Varicap, Voltcap, Voltage changeable capacitance, or Tunning diode are all names for a varactor diode.
The varactor diode's job is to accumulate charges, hence it is constantly maintained in reverse bias. Whenever a forward bias voltage is provided, electric current passes, causing the depletion area to shrink, which would be unfavorable.
The symbol of the varactor diode is shown below:
Therefore, the varactor diode provides a variable capacitance.
