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Problem with the filter of DAC (low noise decrease)

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the filter of DAC

i have completed a filter that 3db frequence is 400M and Au is -40db in the frequence of 16M. But the signal from the DAC through the filter Au decreased only -30db in the 16M. why? thank you for your help!
 

Re: the filter of DAC

The filter specifications do not appear to be consistent. Did you mean to say that the 3db frequency is 4.00M? With a corner frequency of 400MHz, the gain at 16MHz should be aprroximately 0db.
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What type of filter did you design? If it is a digital filter, you could be having aliasing problems, depending on what your sampling rate is.
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How about some more details?
 

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