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The finite voltage gain of a non-inverting operational amplifier is A and the resistance used is R1 and R2 in which R2 is the feedback resistance. Under what conditions it can one use the expression 1 + R2/R1 to determine the gain of the amplifier?

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The finite voltage gain of a non-inverting operational amplifier is A and the resistance used is R1 and R2 in which R2 is the feedback resistance. Under what conditions it can one use the expression 1 + R2/R1  to determine the gain of the amplifier?

(a) A ~ R2/R1

(b) A >> R2/R1

(c) A << R2/R1

(d) None of the mentioned

I have been asked this question in an interview.

This key question is from The Non Inverting Configuration in portion Operational Amplifiers of Electronic Devices & Circuits

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Correct choice is (b) A >> R2/R1

To elaborate: The formula is valid for the ideal case in which the value of A is infinite, practically it should be very large when compared to R2/R1 .

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