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Analog ElectronicsSmall-Signal Amplifiers

A BJT has beta = 120 and gm = 60 mS. Its hybrid-pi input resistance r_pi is approximately?

  • A500 ohm
  • B1 kOhm
  • C2 kOhm
  • D7.2 kOhm
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Correct Answer: C. 2 kOhm
Explanation: r_pi=beta/gm=120/0.06=2000 ohm=2 kOhm.
Reference: Standard analog electronics: hybrid-pi model
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