Hi, Hooman Thank you very much for your reply. Yes, the LM96530 outputs are AC coupled to the AFE5803 . You give me really good suggestions from hardware view. I will change the values of the two resistors you mentioned. And the AFE5803 also has high pass filters in side. The AC coupling capacitor can effect the cut-off frequency. But it can not remove the low frequency noise completely. Is it necessary to do high pass in the software? Best, Phx
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