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Analog ElectronicsTransistor Amplifiers

For a BJT with beta = 100 and gm = 50 mS, the hybrid-pi input resistance r_pi is approximately?

  • A200 ohm
  • B2 kOhm
  • C5 kOhm
  • D50 kOhm
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Correct Answer: B. 2 kOhm
Explanation: r_pi = beta/gm = 100/0.05 = 2000 ohm = 2 kOhm.
Reference: Standard analog electronics: transistor amplifiers
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