In all base driver amplifiers__________?
Correct answer: A. ac collector voltage is 180° out of phase with ac base voltage
- A. ac collector voltage is 180° out of phase with ac base voltage
- B. ac emitter voltage is 180° out of phase with ac base voltage
- C. ac collector voltage is in phase with ac base voltage
- D. none of the above
Explanation
In a common-emitter, or base-driven, amplifier, an increase in base voltage increases collector current and the voltage drop across the collector resistor, so collector voltage falls. Therefore, collector and base AC voltages are 180° out of phase.
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