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Electronic Devices & Circuits PN Junction Diode

The dynamic (small-signal) resistance of a forward-biased diode at room temperature is approximately VT/ID. If ID = 1 mA and VT = 25 mV, rd is?

A2.5 ohm
B25 ohm
C250 ohm
D25 kOhm

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Correct Answer: B. 25 ohm

Explanation: Using rd ≈ VT/ID gives 25 mV / 1 mA = 25 ohm.

Reference: Standard semiconductor electronics: diode small-signal resistance

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