Hן Chris Thanks for the detail answer. I'm aware for the phase delay of the components you mention. My problem is the change of the phase delay between 3 channels of sampling. The phase delay of of the digital filter is the same for the 3 channels (using the same clock)- so , it's not a problem for me. For the input filter , I can control the precition of the component and so control the variance of the phase delay between 3 channels. The 280 resistor tolerance is something that I can't control and I have to calculate the of the phase delay variance. do you have any idea what is th evariance betwen the AD from the same batch? Best regards, Shaike
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