Question
What type of amplifier circuit is shown in Figure E7-1?
Answer Options
- A) Common base
- B) Common collector
- C) Common emitter
- D) Emitter follower
Correct Answer: C
Explanation
The type of amplifier configuration is determined by which of the three transistor terminals (base, emitter, or collector) is common to both the input and the output signal paths. The input is applied to the base, the output is taken from the collector, and the emitter is effectively connected to ground via capacitor C3 (for AC signals).
Therefore, the amplifier circuit shown in Figure E7-1 is a Common emitter amplifier. This configuration is widely used for general-purpose voltage amplification because it provides both high voltage gain and a medium input impedance, while the output signal is 180 degrees out of phase with the input (the voltage changes are inverted, so that a positive-going signal on the input becomes a negative-going signal on the output).
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