Open-loop gain: Difference between revisions

Revision as of 22:35, 14 December 2016

Revision as of 22:39, 14 December 2016

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Open loop gain, in some amplifiers, can be exceedingly high. An ''ideal'' operational amplifier 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 op-ampamplifier sowith thathigh theopen loop gain ofso that the overall effective gain [[electrical network|circuit]] is defined and kept to a desired figure.

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 operational amplifiers have limited [[Bandwidth (signal processing)|bandwidth]].

==Definition==

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In this manner, the open-loop gain is important for computing the actual gain for a given non-ideal operational amplifier network in situations where the ideal model of an operational amplifier begins to become inaccurate.

==Operational amplifiers==

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 operational amplifiers have limited [[Bandwidth (signal processing)|bandwidth]].

== See also ==