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AD9253 - Input Anti-aliasing Filter

Question asked by veera on Dec 6, 2012
Latest reply on Dec 10, 2012 by veera

Can we use higher order LC filter as an anti-aliasing filter. In all the circuits I have seen, the anti-aliasing filter seems to be only 3rd order filter. However, we are using IF sampling ADC and ADC output frequency of interest is very low and hence the aliasing signals at the ADC input will be very close to the desired signal. So we require 5th order or higher filter.

Will the higher order filter cause any distortion to the original signal to the original signal apart from the insertion loss? Is it recommended to use such filters?

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