Hi William, Thank you for your post and welcome to our forum! The non-linear response should not affect the ECG signal at those low frequencies. It would be more of a concern if this non-linearity occurred within the ECG signal bandwidth of interest. In that case, the signal content would become rather distorted. Keep in mind that even simple R-C high-pass filters have a non-linear phase response as well. This input structure is used frequently in AC-coupled ECG applications that do not use a driven right-leg electrode to bias the patient. Best Regards,
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