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A common emitter amplifier given an output of 3 \mathrm{~V} for an input of 0.01 \mathrm{~V}. If \beta of the transistor is 100 and the input resistance is 1 \mathrm{k} \Omega, then the collector resistance is

Option: 1

1 \mathrm{k} \Omega


Option: 2

3 \mathrm{k} \Omega


Option: 3

30 \mathrm{k} \Omega


Option: 4

30 \mathrm{k} \Omega


Answers (1)

best_answer

In common emitter amplifier
Voltage gain = current gain \mathrm{\times } resistance gain
Or  \mathrm{A_V=\beta \times \frac{R_o}{R_i} }
Or \mathrm{ \frac{V_o}{V_i}=\beta \frac{R_o}{R_i} }
Or  \mathrm{\frac{3}{0.01}=100 \times \frac{R_o}{1 \times 10^3} }
Or  \mathrm{R_o=\frac{3}{0.01}=3 \mathrm{k} \Omega }

Posted by

manish painkra

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