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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Operational Amplifiers topics include: Ideal operational amplifiers, inverting and non-inverting configuration, differentiators and differential amplifiers, operational amplifiers, finite open loop gain effect, circuit performance bandwidth and large signal operations. An operational amplifier (op-amp) is a high-gain electronic voltage amplifier that has a differential input and a single-ended output. It produces an output voltage by applying an open-loop gain to the difference between the voltage at the noninverting input terminal and the voltage at the inverting input terminal.  Op-amps... Show more

The finite voltage gain of a non-inverting operational amplifier is A and the resistance used is R<sub>1</sub> and R<sub>2</sub> in which R<sub>2</sub> is the feedback resistance. Under what conditions it can one use the expression 1 + R<sub>2</sub>/R<sub>1</sub> to determine the gain of the amplifier?