Hello Ryan, Thanks for your reply device Id problem is solved and I have found one thing when I m using pc charger that time I am getting clean Ecg but when I am not charging the pc I am getting noisy waveform so most probably it is a ground issue but in my layout both digital and analog gnd are seperate and my input to this board for Ecg is through fluke analyzer I am not using RLD also I made it buffer. I am attaching images with pc charging and without charging. Sampling rate -125samples/sec, Gain-12. /resized-image/__size/320x240/__key/communityserver-discussions-components-files/73/pastedimage1746509685650v1.png
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