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

Correct answer: B. 1250 aligned Voltage gain & =(β)( R_0 R_i )=50 β & =(50 × 100)/(200)=25 Power gain & =(125)^2 × (200)/(100) & =(125)^2 × (200)/(100) & =625 × (200)/(100) & =1250 aligned

NEET 2007

Exam: NEET
Year: 2007
Subject: Physics
Chapter: Semiconductors

NEET 2007 · Physics · Semiconductors

A common emitter amplifier has a voltage gain of 50, an input...

A common emitter amplifier has a voltage gain of 50, an input impedance of

100 \Omega

and an output impedence of 200

\Omega

. the power gain of the amplifier is:

Options

A1000
B1250
C100
D500

Correct answer

B. 1250

Step-by-step solution

\begin{aligned} \text{ Voltage gain } & =(\beta)\left(\frac{\mathrm{R}_0}{\mathrm{R}_i}\right)=50 \\ \Rightarrow \quad \beta & =\frac{50 \times 100}{200}=25 \\ \text{ Power gain } & =(125)^2 \times \frac{200}{100} \\ & =(125)^2 \times \frac{200}{100} \\ & =625 \times \frac{200}{100} \\ & =1250 \end{aligned}

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