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Analog ElectronicsTransistor Amplifiers

A common-emitter amplifier has gm = 25 mS and an effective collector load of 4 kOhm. Neglecting emitter degeneration and output resistance, its voltage gain is approximately?

  • A-10
  • B-25
  • C-100
  • D-160
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Correct Answer: C. -100
Explanation: For the simplified small-signal model, Av ≈ -gmRL = -(0.025)(4000) = -100.
Reference: Standard analog electronics: transistor amplifiers
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