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Analog ElectronicsSmall-Signal Amplifiers

For a BJT biased at IC = 2 mA at room temperature, using VT approximately 25 mV, the small-signal transconductance gm is closest to?

  • A20 mS
  • B40 mS
  • C80 mS
  • D200 mS
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Correct Answer: C. 80 mS
Explanation: gm=IC/VT=2 mA/25 mV=0.08 S=80 mS.
Reference: Standard analog electronics: BJT transconductance
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