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Electronic Devices & CircuitsBJT Amplifiers

For a BJT with beta=100 and gm=40 mS, the small-signal base-emitter resistance r_pi is approximately?

  • A250 ohm
  • B2.5 kiloohm
  • C4 kiloohm
  • D40 kiloohm
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Correct Answer: B. 2.5 kiloohm
Explanation: rπ=beta/gm=100/0.04=2500 ohm=2.5 kOhm.
Reference: Standard analog electronics: hybrid-pi model
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