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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.

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in Linear Integrated Circuits by (37.1k points)
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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