Open Loop Gain
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The open-loop gain of an op-amp is the gain obtained when no feedback is used in the circuit. Open-loop gain A=VOUT/VE , where VE = VIN+ - VIN-, is the difference between the voltage signals applied at its two input terminals.

Normally, feedback is applied around the op-amp so that the gain of the overall circuit is defined and kept to a number which is more usable. However, the very high gain of the op-amp enables considerable levels of feedback to be applied to achieve the required performance.

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