Physics, asked by pawannarvariya555, 10 months ago

In a negative feedback amplifier the gain without feedback is 100, feedback ratio is
1/25 and input voltage is 50 mV. Calculate :
25
(i) gain with feedback (ii) feedback factor.​

Answers

Answered by rahul123437
0

Gain with feedback and feedback factor are 20 and 5 respectively

To find : The gain with feedback and the gain factor

Given :

It is given that the gain without feedback is 100, feedback ratio is \frac{1}{25} and input voltage is 50 mV.

Let us denote gain without feedback as A and gain with feedback as G. Feedback ratio is denoted by β.

Then,

G=\frac{A}{1+\beta G}

$G=\frac{100}{1+\left(100 \times \frac{1}{25}\right)}$

Gain with feedback G=20

Feedback factor,F is given by (1+\beta G)

∴Feed back factor

$F=1+\left(100 \times \frac{1}{25}\right)$

Feedback factor F=5

Hence, (i)the gain without feedback is 20 and (ii) the feedback factor is 5

To learn more..

1. The voltage gain of an amplifier without feedback is

100. Find voltage gain with 7% of negative

feedback.

brainly.in/question/15064214

Answered by bestwriters
0

(i) The gain with feedback is 20

(ii) The feedback factor is 5

Explanation:

The gain with feedback is given by the formula:

Af = A/(1 + βA)

Where,

A = Gain without feedback = 100

β = Feedback ratio = 1/25

On substituting the values, we get,

Af = 100/(1 + (1/25 × 100))

Af = 100/(1 + 4)

Af = 100/5

∴ Af = 20

The feedback factor is given by the formula:

F = 1 + βA

On substituting the values, we get,

F = 1 + (1/25 × 100)

F = 1 + 4

∴ F = 5

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