Hi Xiang Miao, Is the output you are seeing on the oscilloscope from the DAC or the op amp? There's no capacitors on the screenshot you sent on the op amp power supplies, are they just missing from the screenshot? Also, could you explain a bit more what you're seeing on the oscilloscope? Is the yellow line the output and the pink line a zoomed in version? Additionally, see how much noise the output has when you are not writing to the DAC. While unlikely, there could be some digital feedthrough. Thanks, Erin
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