Open-loop gain: Difference between revisions

Revision as of 21:42, 31 December 2018

Revision as of 21:43, 31 December 2018

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{{Unreferenced stub|auto=yes|date=December 2009}}

The '''open-loop gain''' of an [[amplifier]] is the [[Gain (electronics)|gain]] obtained when no overall [[feedback]] is used in the [[electrical network|circuit]].

Open loop gain, in some amplifiers, can be exceedingly high. An ''ideal'' [[operational amplifier]] (op-amp) has infinite open-loop gain. Typically an op-amp may have a maximal open-loop gain of around <math>10^5</math>. The very high open-loop gain of the op-amp allows a wide range of feedback levels to be applied to achieve the desired performance.

Normally, feedback is applied around an amplifier with high open loop gain so that the effective gain [[electrical network|circuit]] is defined and kept to a desired figure.