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Electronic Devices & CircuitsBJT Amplifiers

A BJT has beta = 100 and gm = 40 mS. Its small-signal base-emitter resistance r_pi is approximately?

  • A250 ohm
  • B2.5 kOhm
  • C25 kOhm
  • D40 kOhm
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Correct Answer: B. 2.5 kOhm
Explanation: In the hybrid-pi model, r_pi = beta/gm = 100/0.04 = 2500 ohm = 2.5 kOhm.
Reference: Standard analog electronics: hybrid-pi model
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