In a common emitter amplifier circuit using an

Question:

In a common emitter amplifier circuit using an $\mathrm{n}-\mathrm{p}-\mathrm{n}$ transistor, the phase difference between the input and the output voltages will beĀ 

  1. $135^{\circ}$

  2. $180^{\circ}$

  3. $45^{\circ}$

  4. $90^{\circ}$


Correct Option: , 2

Solution:

In common emitter amplifier circuit input and out put voltage are out of phase. When input voltage is increased then $\mathrm{i}_{\mathrm{b}}$ is increased, $\mathrm{i}_{\mathrm{c}}$ also increases so voltage drop across $\mathrm{R}_{\mathrm{c}}$ is increased. However increase in voltage across $R_{C}$ is in opposite sense.

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