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During forward bias, the PIN diode acts as _______

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During forward bias, the PIN diode acts as _______

(a) a variable resistor

(b) a variable capacitor

(c) a switch

(d) an LED

This question was addressed to me in exam.

My question is taken from p-i-n Diode and its Characteristics in division Semiconductor-Diode Characteristics of Electronic Devices & Circuits

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Best answer
The correct choice is (a) a variable resistor

The best explanation: In forward bias, the forward resistance decreases and acts as a variable resistor. The low frequency model of a PIN diode neglects the input capacitive values.

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