An amplifier without feedback has a voltage gain of 50,input resistance os 1 KΩ & Output resistance of 2.5KΩ.The input resistance of the current-shunt negative feedback amplifier using the above amplifier with a feedback factor of 0.2 is___________?
Correct answer: A. 1/11KΩ
- A. 1/11KΩ
- B. 1/5KΩ
- C. 5KΩ
- D. 11KΩ
Explanation
Current-shunt feedback reduces input resistance by the factor 1 + Aβ. Here 1 + Aβ = 1 + 50(0.2) = 11, so the new input resistance is 1 kΩ/11 = 1/11 kΩ.
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