In a common emitter amplifier, the resistance of the output circuit is 500 times the resistance of the input circuit. If $α$ = 0.98 , then find the voltage gain and the power gain:
Answer & explanation
Correct answer: option 2
Given $α = 0.98$ and $\frac{R_{out}}{R_{in}}=500$
$β=\frac{α}{1-α}=\frac{0.98}{1-0.98}=49$
Voltage gain = $(β)(\frac{R_{out}}{R_{in}})=(49)(500)=24500$
Power gain = $(β^2)(\frac{R_{out}}{R_{in}})=(49)^2(500)=1200500$