First slide

Transistors

Question

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

Difficult

A

1.25
B

100
C

90
D

10

Solution

$G a i n A_{f} w i t h N e g a t i v e f e e d b a c k i s A_{f} = \frac{A}{1 + β A},$
$w h e r e β = \frac{9}{100} = 0.09 a n d A_{f} = 10$
$\Rightarrow 10 = \frac{A}{1 + 0.09 A}$
$\Rightarrow 10 + 0.9 A = A \Rightarrow A = 100 [G a i n w i t h o u t f e e d b a c k]$

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