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Analog ElectronicsTransistor Amplifiers

A BJT is biased at IC = 2.5 mA. Using VT = 25 mV, its intrinsic emitter small-signal resistance re ≈ VT/IE is closest to?

  • A1 ohm
  • B10 ohm
  • C100 ohm
  • D1 kOhm
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Correct Answer: B. 10 ohm
Explanation: With IE approximately equal to IC, re ≈ 25 mV/2.5 mA = 10 ohm.
Reference: Standard analog electronics: transistor amplifiers
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