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

Correct answer: (C) 1250. Voltage gain =β × impedance gain ⇒ 50=β × 200/100 ⇒ β=25 Also, power gain =β^2 × impedance gain =(25)^2 × 200/100=1250

Q140 / 200 · NEET 2010 (Screening) · Physics

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

A
500
B
1000
Correct answer
C
1250
D
50

Solution

Voltage gain $=\beta \times$ impedance gain $$ \Rightarrow \quad 50=\beta \times \frac{200}{100} \Rightarrow \beta=25 $$ Also, power gain $=\beta^2 \times$ impedance gain $$ =(25)^2 \times \frac{200}{100}=1250 $$

Hence, the correct answer is option: 'C'.

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