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Define the input resistance with feedback for voltage series feedback amplifier?

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in Linear Integrated Circuits by (37.1k points)
Define the input resistance with feedback for voltage series feedback amplifier?

(a) RIF = (1-AB)

(b) RIF = (AB-1)

(c) RIF = (1+AB)

(d) None of the mentioned

The question was asked in a national level competition.

The doubt is from Voltage Series Feedback Amplifier topic in section Operational Amplifier Characteristics of Linear Integrated Circuits

1 Answer

0 votes
by (39.8k points)
Accurate answer is (c) RIF = (1+AB)

In the realm of explanation: In feedback amplifier, the input resistance of the op-amp with feedback is (1+AB) times that of without feedback.

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