Open-loop gain: Difference between revisions

Revision as of 20:52, 18 May 2005

Revision as of 10:50, 19 May 2005

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'''Open loop [[gain]]''' of an [[operational amplifier]] is a gain obtained when no [[feedback]] is used in the [[circuit]].

Open loop gain is usually exceedingly high, ideal operational amplifier has infinite open loop gain. Typically an op-amp may have an open loop gain of around <math>10^5</math>. Normally feedback is applied around the op-amp so that the gain of the overall [[circuit]] is defined and kept to a figure which is more usable. However the very high gain of the op-amp enables considerable levels of feedback to be applied to achieve required performance. The open loop gain of an operational amplifier falls very rapidly with increasing [[frequency]]. Along with [[slew rate]], this is one of the reasons why operation amplifiers have limited [[bandwidth]].

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