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Write the formula for closed loop voltage gain of inverting amplifier with feedback using open loop voltage gain and gain of feedback circuit.

(a) AF= A/(1+AB)

(b) AF= -A/(1+AB)

(c) AF= -B/(1+AB)

(d) None of the mentioned

I got this question in final exam.

This question is from Voltage Shunt Feedback Amplifier in division Operational Amplifier Characteristics of Linear Integrated Circuits

1 Answer

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by (39.8k points)
Right option is (c) AF= -B/(1+AB)

Delve into insight with: The closed loop voltage gain of the amplifier is AF= -Ak/(1+AB), where k is a voltage attenuation factor. In addition to phase inversion, AF is k times the closed loop gain of the non-inverting amplifier where k<1.

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