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Problem with subtractor!!

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aPaCh3

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Hey,
I need help with this subtractor in Orcad. I am actually trying to separate harmonics from actual wave.For this purpose I used butter-worth filter followed by subtractor.
But I am not getting desired output.Butter-worth filter is working fine but i think i have problem with subtractor.
I have attached both circuit diagram and output.In output.jpg yellow trace is desired one and purple is actual.
 

Hi aPaCh3,

I suppose, the input amplitude is too large. Reduce it or increase the power rails of the ideal opamp model (can be modified by double click).
 

Thnx for the solution finally It is working
 

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