Semiconductors: p-n Junction Capacitance MCQ

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p-n Junction CapacitanceHardQuestion 20231

Question

The junction capacitance of a reverse-biased p-n junction:

A
Increases with reverse voltage
B
Decreases with increasing reverse voltage (wider depletion layer)
Correct
C
Is independent of voltage
D
Increases until breakdown

Correct answer

Decreases with increasing reverse voltage (wider depletion layer)

Explanation

C ∝ 1/W where W = depletion width. Reverse bias increases W → C decreases. Varactor (varicap) diodes exploit this voltage-dependent capacitance for frequency tuning in oscillators and filters.

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