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== Role in non-ideal gain ==
The open-loop gain is a physical attribute of an operational amplifier that is often finite in comparison{{Clarify|date=March 2016}} to the usual gain, denoted <math>G</math>. While open-loop gain is the gain when there is no feedback in a circuit, an operational amplifier will often be configured to use a feedback configuration such that its gain will be controlled by the feedback circuit components.
Take the case of an inverting operational amplifier configuration. If the resistor between the single output node and the inverting input node is <math>R_2</math> and the resistor between a source voltage and the inverting input node is <math>R_1</math>, then the ideal gain for such a circuit at the output terminal is defined, ideally, to be:
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