The common-mode voltage gain of a differential amplifier is equal to RC divided by _______________?
Correct answer: D. 2RE
- A. r'e
- B. 2r'e
- C. r'e/2
- D. 2RE
Explanation
For common-mode operation, both transistor currents change together, so the effective emitter resistance is approximately 2R_E. The common-mode gain is therefore A_c = R_C/(2R_E), giving option d.
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