A change in the value of the emitter resistance Re in a differential amplifier?
Correct answer: B. affects the common mode gain Ac
- A. affects the difference mode gain Ad
- B. affects the common mode gain Ac
- C. affects both Ad and Ac
- D. does not effect either Ad and Ac
Explanation
Changing the emitter or tail resistance mainly changes the common-mode gain because common-mode currents flow through this resistance. The ideal difference-mode gain is largely independent of it.
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