The input signal given to C.E. amplifier having a voltage gain of 126 is V i = 2 cos ( 12 t + 3 π ) . The corresponding output signal will be

Question

The input signal given to C.E. amplifier having a voltage gain of 126 is V i ​ = 2 cos ( 12 t + 3 π ​ ) . The corresponding output signal will be

TestHub · Accepted Answer

The voltage gain of the common emitter amplifier is $A_{v} = 126$ .

The input signal is $V_{i} = 2 cos (12 t + \frac{π}{3})$ .

In a common emitter amplifier, the output voltage is amplified by a factor of $A_{v}$ and has a phase shift of $π$ radians ( $18 0^{\circ}$ ) with respect to the input signal.

The output voltage is given by $V_{o} = A_{v} V_{m} cos (ω t + ϕ + π)$ .

Substituting the given values:

$V_{o} = 126 \times 2 cos (12 t + \frac{π}{3} + π)$

$V_{o} = 252 cos (12 t + \frac{4 π}{3})$

Answer: $252 cos (12 t + \frac{4 π}{3})$

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