Hello Ke, Thank you for your post and welcome to our forum! It's very difficult to understand the problem from this scope capture alone. Can you elaborate on the system using the ADS1292R : what are the applied voltages are at the PGA inputs, how is the device configured (supplies, register settings), where do the supplies originate from, etc? I'm also curious as to the reason you decided to look at this closely in the first place. Are you not getting valid data out of the ADS1292R ? The glitches on AVDD appear to be about 5.5 seconds apart. Is there something on your board that occurs every ~5.5 seconds? Best Regards,
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