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Question

A transistor is used in common emitter mode as an amplifier. Then:


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Solution

Transistor:

  1. When a transistor is used as an amplifier in common emitter mode, the base-emitter junction serves as the input junction and the collector-emitter junction serves as the output junction.
  2. Applying forward voltage to the input junction causes it to be forward biased, and applying reverse voltage causes it to be reverse biassed.

Therefore, the emitter-base junction is forward completely biased when utilizing a transistor as just a common emitter amplifier, and the signals to be amplified are linked mostly in the emitter-base circuit.


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