Open-loop gain: Difference between revisions

Revision as of 18:57, 13 December 2016

Revision as of 22:35, 14 December 2016

Line 1:

{{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, iscan usuallybe exceedingly high;. in fact, anAn ''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>. Normally, feedback is applied around the op-amp so that the gain of the overall [[electrical network|circuit]] is defined and kept to a figure which is more usable. 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-amp so that the gain of the overall [[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==

The definition of open-loop gain (at a fixed frequency) is