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A common emitter amplifier has a voltage...

A common emitter amplifier has a voltage gain of 50, an input impedance of `100Omega` and an output impedance of 200 `Omega`. The power gain of the amplifier is :-

A

1000

B

1250

C

100

D

500

Text Solution

Verified by Experts

The correct Answer is:
B
Given : Voltage gain `A_(v)=50`
Output resistance `R_(o)=200Omega,` Input resistance
`R_(i)=100Omega`
Power gain`=alpha_(ac)^(2)((R_(o))/(R_(i)))`
`=(A_(vac).(R_(i))/(R_(o)))^(2)(R_(o))/(R_(i))=A_(vac)^(2)xx(R_(i))/(R_(o))=50^(2)xx(100)/(200)=1250`
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