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Electronic Devices & Circuits PN Junction Diode

The small-signal resistance of a forward-biased diode at a fixed operating point is approximately proportional to?

AThermal voltage divided by diode current
BDiode current divided by thermal voltage
CSquare of reverse voltage only
DZero for every current

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Correct Answer: A. Thermal voltage divided by diode current

Explanation: From the exponential diode equation, the incremental resistance is approximately rd = nVT/ID at the operating point.

Reference: Standard semiconductor electronics: diode small-signal resistance

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