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During reverse bias, the PIN diode acts as _______(a) Variable resistor(b) Switch(c) Variable capacitor(d) LEDI 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

Answer»

Right option is (c) VARIABLE capacitor

To explain: In reverse BIAS, the intrinsic layer is completely covered by depletion layer. Thestored charges vanishes acting LIKE a variable capacitor. The high frequency model of a PIN diode neglects the input RESISTANCES.



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