Semiconductor Electronics Materials Devices And Simple Circuits Ques 2
In a common emitter transistor amplifier the audio signal voltage across the collector is $3 $ $\mathrm{V}$. The resistance of the collector is $3 $ $\mathrm{k} \Omega$. If current gain is $100$ and the base resistance is $2$ $\mathrm{k} \Omega$, the voltage and power gain of the amplifier is
[2017]
(a) $15 $ and $200$
(b) $150 $ and $15000$
(c) $20 $ and $2000$
(d) $200 $ and $1000$
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Answer:
Correct Answer: 2.(b)
Solution: (b) Given that the current gain $\beta=100, $\mathrm{R} _{\mathrm{c}}-3 \mathrm{k} \Omega, $ $\mathrm{R} _{\mathrm{b}}$ $=2 \mathrm{k} \Omega$
Voltage gain $\left(A_v\right)=\beta \frac{R_c}{R_b}=100\left(\frac{3}{2}\right)=150$
Power gain $=A_v \beta=150 \times 100=15000$
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