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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. Devices
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