Question
In a common emitter amplifier circuit using an n-p-n transistor, the phase difference between the input and the output voltages will be
-
135°
-
180°
-
45°
-
90°
Solution
B.
180°
In common emitter amplifier circuit input and output voltage are out of phase. When the input voltage is increased then ib is increased, ic also increases so the voltage drop across Rc is increased. However, increase in voltage across RC is in opposite sense.
