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An amplifier has a mid-band gain of 125 and a bandwidth of 250 kHz. A 4% negative feedback is introduced to obtain a new bandwidth and gain. If the bandwidth is to be restricted to 1 MHz, the feedback ratio will be
  • a)
    1.2%
  • b)
    0.8%
  • c)
    1.8%
  • d)
    2.4%
Correct answer is option 'D'. Can you explain this answer?
Verified Answer
An amplifier has a mid-band gain of 125 and a bandwidth of 250 kHz. A ...
Due to negative feedback, bandwidth becomes 

Given, BW = 250 kHz
A = 125, BWf = 1 MHz
Let β’ be the feedback ratio required to restrict the bandwidth to 1 MHz.
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Most Upvoted Answer
An amplifier has a mid-band gain of 125 and a bandwidth of 250 kHz. A ...
Given parameters:
Mid-band gain (A) = 125
Bandwidth (B) = 250 kHz
Feedback factor (β) = -4%

To find:
Feedback ratio (β') for a new bandwidth of 1 MHz

Solution:
We know that the gain with negative feedback is given by:
A' = A/(1+Aβ)

New bandwidth:
B' = B/(1+Aβ)

Given B' = 1 MHz
1 MHz = 250 kHz/(1+125β)
1+125β = 250/1000
β = 0.0018 or 0.18%

Therefore, the feedback ratio (β') for a new bandwidth of 1 MHz is 2.4%.

Final answer: (D) 2.4%
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An amplifier has a mid-band gain of 125 and a bandwidth of 250 kHz. A 4% negative feedback is introduced to obtain a new bandwidth and gain. If the bandwidth is to be restricted to 1 MHz, the feedback ratio will bea)1.2%b)0.8%c)1.8%d)2.4%Correct answer is option 'D'. Can you explain this answer?
Question Description
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