Hi Bryan I am sorry that I failed to describe it clearly, let's forget the item of target signal for a moment and consider it as a noise for testing the ADC device, after designing the ADC test board we did some verification, when the ADC inputs were unconnected and the differential pairs were shorted with jumper wires the sampling revealed an odd harmonic of 50Hz, searching for the information I understand that this interference may come from space or power supply, I would like to hardware level to I want to eliminate or reduce this interference at the hardware level, is there any good recommended method. Best regards
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