how to design a substracor with high accuracy?

[tuza2000]

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

 

[yibinhsieh]

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

Yibin.

 

[sunking]

use current mirror