Signal Processing method

[Zayzoon]

Hello,

I am trying to find a way of referencing signal A,B,C,D to signal R with very minimal mismatch to impedance.

for example i am currently passing the signals through a diff-pair like so

A-R
B-R
C-R
D-R

Signal R is being generated through circuitry that is also seen by the other signals thus causing increased noise and impedance mismatch which significantly contributes negatively to the common mode rejection.

any advise as to what i can try to minimize what i am dealing with? i have worked on a few topologies that would share a few nodes but i would appreciate any advice i can get from this community.

Thanks.

 

[goldsmith]

Dear friend. Hi.
This question should being at Digital forum of edaboard!

 

[Zayzoon]

This is not a digital question...it is 100% analog.