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in feedback control systems, the error amplifier is just a differential amplifier the subtract the feedback signal from the set point to get the error signal.
I suppose this concept will equally apply to your problem
It's like what Mr.Amrstaha said and add to it that the error signal in most cases is mutiplied by a factor to be suitable for the actuator operation or whatever after the error amplifier.
I hope you have got it.
El-Hadidy
Added after 3 minutes:
I am sorry I don't have enough information about the error amplifier current mirror.
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