Question:
The gain of an amplifier with positive feedback is given by the relation
The gain of an amplifier with positive feedback is given by the relation
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Positive feedback increases gain.
Updated On: Jul 2, 2026
- \(A(1+\beta)\)
- \(\frac{\beta}{1+A\beta}\)
- \(\frac{\beta}{1-A\beta}\)
- \(\frac{A}{1-A\beta}\)
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The Correct Option is D
Solution and Explanation
Concept:
Gain with feedback:
\[
A_f = \frac{A}{1 \pm A\beta}
\]
Step 1: Identify feedback type Positive feedback → denominator has minus sign.
Step 2: Write expression \[ A_f = \frac{A}{1 - A\beta} \]
Step 3: Understand effect Gain increases with positive feedback.
Step 4: Compare options Matches option (D).
Step 5: Conclusion \[ \boxed{\frac{A}{1 - A\beta}} \]
Final Answer: \[ \boxed{(D)} \]
Step 1: Identify feedback type Positive feedback → denominator has minus sign.
Step 2: Write expression \[ A_f = \frac{A}{1 - A\beta} \]
Step 3: Understand effect Gain increases with positive feedback.
Step 4: Compare options Matches option (D).
Step 5: Conclusion \[ \boxed{\frac{A}{1 - A\beta}} \]
Final Answer: \[ \boxed{(D)} \]
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