Q140
An amplifier without feedback has a voltage gain of 50, input resistance of 1 kΩ and output resistance of 2.5 kΩ. The input resistance of the current-shunt negative feedback amplifier using the above amplifier with a feedback factor of 0.2 is
A.
kΩ
AnswerB.
kΩ
C.
5 kΩ
D.
11 kΩ
Answer: Option A
Solution
Answer: Option A
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