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Analog ElectronicsSmall-Signal Amplifiers

A common-emitter stage has gm=40 mS and an effective collector load of 2 kOhm. Neglecting ro and emitter degeneration, its approximate small-signal voltage gain is?

  • A+20
  • B-20
  • C+80
  • D-80
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Correct Answer: D. -80
Explanation: For the simplified CE stage, Av≈-gmRC=-0.04×2000=-80.
Reference: Standard analog electronics: common-emitter gain
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