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INA188: INA188 OPAMP & Digital Rogowski Coil Integrator

Part Number: INA188

Hi ! 

I am testing high speed op amp integrator for rogowski coil.  reference is http://www.ti.com/lit/ug/tidubv4a/tidubv4a.pdf

Using INA188D, Circuit is same above reference.

I sampled data. and I simulated in matlab. but. i can't remove bias from noise.

Here's the integration code

B = 0.9999;
T = 0.2;
for i=1:size(data) 
     result(i) = B * result(i-1) + (T * data(i)); 
end

How can I solve this problem? 

(Do I check the op amp hardware?

What I need to check ?)

Thank you!.