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Differential Amplifier or Summing Amplifier are usually used in a closed loop control system.

The error signal will be the DIFFERENCE between the setpoint value and feedback value for Differential Amplifier. Whereas for Summing Amplifier, the error signal will be the difference between the setpoint value and feedback value only if one of the value is inverted in polarity.

Another reason Op Amp is used: amplify the error signal as error signals are usually very small.

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