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Error and Uncertainty

When the nega...

Question

When the negative feedback is applied to an amplifier of gain $50$ , the gain after feedback falls to $25$ . Calculate the feedback ratio.

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Solution

Given data:
$A = 50$ ; $A_{f} = 25$
Solution:
Voltage gain after feedback
$A_{f} = \frac{A}{1 + A β}$
$25 = \frac{50}{1 + 50 β}$
Hence, the feedback ratio $b = 0.02$ .

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