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  • A transistor is used in CE mode in an amplifier circuit. when a signal of  is adde

A transistor is used in CE mode in an amplifier circuit. when a signal of 20 \mathrm{mV} is added to the base emitter voltage, the base current changes by 20 \mu \mathrm{A} and the collector current changes by 2 \mathrm{~mA}. The load resistance is 5 \mathrm{k} \Omega. Then voltage gain is

Option: 1

300


Option: 2

500


Option: 3

600


Option: 4

750


Answers (1)

best_answer

\beta=\frac{\Delta I_C}{\Delta I_B}=\frac{2 \times 10^{-}}{20 \times 10^6}=100

Input resistance R_{\text {in }}=\frac{\Delta V_{B E}}{\Delta I_B}=\frac{20 \times 10^{-3}}{20 \times 10^{-6}}
=1 \mathrm{k} \Omega
\begin{aligned} \text { voltage gain(A v) } & =\beta \times \frac{\text { Rout }}{\operatorname{Rin}} \\ & =100 \times \frac{5 \times 10^3}{10^3}=500 \end{aligned}
 

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seema garhwal

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