The current gain of a BJT is__________?
Correct answer: C. gm rπ
- A. gm r0
- B. gm / r0
- C. gm rπ
- D. gm /rπ
Explanation
For a BJT, the small-signal current gain is approximately β = gm rπ, since gm relates collector current to base-emitter voltage and rπ relates that voltage to base current. Hence option c is correct.
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