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PN Junctions
19 questions By Tony R. Kuphaldt
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Question 19 of 19
The nonconducting depletion region of a PN junction forms a parasitic capacitance between the P and the N semiconductor region. Does the capacitance increase or decrease as a greater reverse-bias voltage is applied to the PN junction? Explain your answer.
Reveal answerThe junction capacitance will decrease as the reverse-bias voltage across the junction increases.
Challenge question: can you think of any practical applications for this variable-capacitance effect?
Notes:This question is a good review of capacitor theory, and also an opportunity to introduce a special kind of diode: the varactor.
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