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Electronic Devices & CircuitsPN Junction Diode

At room temperature, using n=1 and ID=1 mA, a diode’s approximate small-signal resistance with VT≈26 mV is?

  • A2.6 ohm
  • B26 ohm
  • C260 ohm
  • D26 kiloohm
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Correct Answer: B. 26 ohm
Explanation: rd≈VT/ID=26 mV/1 mA=26 ohm.
Reference: Standard semiconductor electronics: diode incremental resistance
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