# Error amplifier (electronics)

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An '''error amplifier''' is an electronic component that amplifies the difference between its two inputs. If one input is a reference signal, this difference can be considered the error in the other.

The error amplifier is usually used with feedback loops owing to its self-correcting mechanism. A common application is in feedback unidirectional voltage control circuits, where the sampled output voltage of the circuit under control is fed back and compared to a stable reference voltage. Any difference between the two generates a compensating error voltage which tends to move the output voltage towards the design specification.

==Devices==
*Discrete [Transistors](/source/Transistors)
*[Operational amplifiers](/source/Operational_amplifiers)

==Applications==
*[Regulated power supply](/source/Regulated_power_supply)
*D.C Power Amplifiers
*[Measurement](/source/Measurement) Equipment
*[Servomechanisms](/source/Servomechanism)

==See also==
*[Differential amplifier](/source/Differential_amplifier)

== External links ==

* [http://www.alphascientific.com/technotes/technote3.pdf Error Amplifier Design and Application] {{Webarchive|url=https://web.archive.org/web/20180328173441/http://www.alphascientific.com/technotes/technote3.pdf |date=28 March 2018 }}, [http://www.alphascientific.com/ alphascientific.com].  Originally accessed 27 April 2009, now 404.  Try [https://web.archive.org/web/20081006222215/http://www.alphascientific.com/technotes/technote3.pdf https://web.archive.org/web/20081006222215/http://www.alphascientific.com/technotes/technote3.pdf]
* Error amplifier as an element in a [voltage regulator](/source/voltage_regulator):<br/>[http://focus.ti.com.cn/cn/lit/an/slyt194/slyt194.pdf Stability analysis of low-dropout linear regulators with a PMOS pass element] {{Webarchive|url=https://web.archive.org/web/20110707022958/http://focus.ti.com.cn/cn/lit/an/slyt194/slyt194.pdf |date=7 July 2011 }}

Category:Electronic amplifiers

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Adapted from the Wikipedia article [Error amplifier (electronics)](https://en.wikipedia.org/wiki/Error_amplifier_(electronics)) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/Error_amplifier_(electronics)?action=history)). Available under [Creative Commons Attribution-ShareAlike 4.0 International](https://creativecommons.org/licenses/by-sa/4.0/). Changes may have been made.