The input impedance of a differential amplifier equals r'e times________________?
Correct answer: D. 2ß
- A. ß
- B. RE
- C. RC
- D. 2ß
Explanation
For a balanced differential pair, the two transistor input resistances appear in series for differential excitation, giving an input resistance of approximately 2βr'e. The factor βr'e applies to one transistor branch, not the complete differential input.
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