# The input signal given to a CE amplifier having a  voltage gain of 150 is . The corresponding output signal will be : Option 1) Option 2) Option 3) Option 4)

P Plabita

As we learnt in

Amplifier -

Transistor is used as an amplifier

- wherein

in such circuit output is amplified as compared to input .

Input signal of a CE amplifier, $V_{i} = 2\cos \left ( 15\:t+\frac{\pi }{3} \right )$

Voltage gain = 150

As CE amplifier give phase difference of $\pi$ between input and output signals,

so $A_{v} = \frac{V_{0}}{V_{i}} \Rightarrow V_{0} = A_{v}\cdot V_{i}$

$V_{0} = 150 \times 2\cos \left ( 15\:t+\frac{\pi }{3} + \pi \right )$

$V_{0} = 300\cos \left ( 15\:t+\frac{4\pi }{3} \right )$

Option 1)

This option is incorrect

Option 2)

This option is incorrect

Option 3)

This option is correct

Option 4)

This option is incorrect

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