Error amplifier (electronics)

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.

• Discrete Transistors
• Operational amplifiers

• Regulated power supply
• D.C Power Amplifiers
• Measurement Equipment
• Servomechanisms

• Differential amplifier

• Error Amplifier Design and Application Archived 28 March 2018 at the Wayback Machine, alphascientific.com. Originally accessed 27 April 2009, now 404. Try https://web.archive.org/web/20081006222215/http://www.alphascientific.com/technotes/technote3.pdf
• Error amplifier as an element in a voltage regulator:
  Stability analysis of low-dropout linear regulators with a PMOS pass element Archived 7 July 2011 at the Wayback Machine