The tail current in a differential amplifier equals ______________?
Correct answer: B. sum of two emitter currents
- A. difference between two emitter currents
- B. sum of two emitter currents
- C. collector current divided by current gain
- D. collector voltage divided by collector resistance
Explanation
The tail current is the total current supplied to the two transistor emitters, so it equals I_E1 + I_E2. In a balanced differential pair, each emitter carries approximately half of the tail current.
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