>I am currently looking into "All-Pass" filters to
>correct (counter) the phase-shift that occurs in
>the pass-band. If anybody has any tips, tricks or
>informative resources are, their more than welcome!

Not sure why phase shift is a problem once you have set the frequency. I
thought one of the advantages of a DDS is that the clock frequency is much
higher than the output frequency, meaning that you should be designing the
filter to kill the clock frequency, not just abouve the output frequency.

Whatever, you need you may be able to use a Chebyshev filter and have the
notch at the clock frequency.

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