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During reverse bias, the PIN diode acts as _______

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During reverse bias, the PIN diode acts as _______

(a) Variable resistor

(b) Switch

(c) Variable capacitor

(d) LED

I have been asked this question in exam.

The origin of the question is p-i-n Diode and its Characteristics topic in portion Semiconductor-Diode Characteristics of Electronic Devices & Circuits

1 Answer

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Right option is (c) Variable capacitor

To explain: In reverse bias, the intrinsic layer is completely covered by depletion layer. The   stored charges vanishes acting like a variable capacitor. The high frequency model of a PIN diode neglects the input resistances.

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