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Electronic Devices & Circuits BJT Amplifiers

For a BJT biased at IC = 1 mA at room temperature, the small-signal transconductance gm is approximately, using VT = 25 mV?

A0.004 S
B0.04 S
C0.4 S
D40 S

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Correct Answer: B. 0.04 S

Explanation: For a BJT, gm = IC/VT. Thus gm = 1 mA / 25 mV = 0.04 S = 40 mS.

Reference: Standard analog electronics: BJT small-signal transconductance

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