Question

An amplifier has \( A_v = 1000 \pm 100 \). Determine the feedback needed to keep the gain within \( \pm 10\% \).

• A. 0.099
• B. 1.000
• C. 1.100
• D. 10.00

Hint:

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.

Answer 1

The Correct Option is A

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).