In a common emitter transistor amplifier the audio signal voltage across the collector is `3 V`. The resistance of collector is `3 kOmega`. If current gain is `100` and the base resistance is `2 kOmega`, the voltage and power gain of the amlifier is :

Options

A. 15 and 200
B. 150 and 15000
C. 20 and 2000
D. 200 and 1000

Answer

B

Explanation

Given: `V_(i)=3V, R_(C )=3kOmega, R_(B)=2kOmega, R_(B)==2kOmega, beta=100`
Voltage gain of the CE amplifier,
`A_(V)=-beta_(ac)((R_(C ))/(R_(B)))=-100((3)/(2))=-150`
Power gain, `A_(P)=betaxxA_(V)=100xx(-150)=-15000`
Negative sign represents the output voltage is in opposite phase with the input voltage.