Question:
An amplifier has \( A_v = 1000 \pm 100 \). Determine the feedback needed to keep the gain within \( \pm 10\% \).
An amplifier has \( A_v = 1000 \pm 100 \). Determine the feedback needed to keep the gain within \( \pm 10\% \).
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Feedback is used to stabilize the gain of amplifiers and keep the output within a desired range. Use the formula for feedback factor to control the gain.
Updated On: May 5, 2025
- 0.099
- 1.000
- 1.100
- 10.00
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The Correct Option is A
Solution and Explanation
The gain of the amplifier is \( 1000 \pm 100 \), meaning the gain can vary from 900 to 1100. To keep the gain within \( \pm 10\% \), we need to reduce the variation. The required feedback can be calculated using the formula for feedback, which ensures the gain stays within the desired range:
\[
\text{Feedback factor} = \frac{100}{1000} = 0.099
\]
Thus, the correct feedback factor is 0.099. Therefore, the correct answer is option (1).
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