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  • The voltage gain of an amplifier with 9% negative feedback is 10. The voltage gain without feedback will be:Option: 1 90<div class='qna

The voltage gain of an amplifier with 9% negative feedback is 10. The voltage gain without feedback will be:

Option: 1

90


Option: 2

100


Option: 3

9


Option: 4

10


Answers (1)

best_answer

The voltage gain of the amplifier with negative feedback is

\mathrm{\mathrm{A}^{\prime}=\frac{\mathrm{A}}{\mathrm{I}+\mathrm{BA}}}

\mathrm{Where, A= voltage\; gain\; without\; feedback }

                \mathrm{\beta= feedback\; factor}

\mathrm{Here, A^{\prime}=10, \beta=9 \%=0.09}

\mathrm{\begin{aligned} & \therefore 10=\frac{\mathrm{A}}{1+0.09 \mathrm{~A}} \\ & 10+0.9 \mathrm{~A}=\mathrm{A} \\ & \mathrm{A}(1-0.9)=10 \\ & \mathrm{~A}=\frac{10}{0.1}=100 \end{aligned} }

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