Hi Erin, Thank you for your reply! THe output I see on the oscilloscope is from the op amp. There is no capacitors on the op amp power supplies in our pcb design, but i soldered a 100nF film capacitor between the V++ and V--. In the oscilloscope screenshot, the yellow line is the output, and the pink line is the fft analysis of the output. The noise i see when I am not writing to the DAC is less significant, It's around 20-30mV range instead 100-150mV range. If it is the digital feedthrough problem, how can i change it? Regards, Lisa
↧
