First slide

Transistor

Question

The voltage gain of an amplifier without feedback is 100. Find voltage gain with 7% of negative feedback.

Easy

A

10
B

12.5
C

15
D

18

Solution

$A' = \frac{A}{1 + βA}, A' = \frac{100}{1 + \frac{7}{100} \times 100}, A' = \frac{100}{8} = 12 .5$

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