how to design a substracor with high accuracy?

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tuza2000

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i want to design a substractor used in a pipeline adc,it's used to substractor the reference voltage from a input voltage .
and i don't want to use switch capacitor ,because it must use a operation amplifier with high gain and high bandwidth,and its hard to desgn.
how can i design a substractor firstly?
thx
 

Maybe you can use OP with resistor feedback. It implements the same function for switch capacitor.

Yibin.
 

use current mirror
 

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