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Chris Rehorn's paper about Sinc interpolation
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bdunham7:

--- Quote from: tom66 on February 14, 2023, 06:15:38 pm ---Been a while as we had it on loan as a demo unit pre-COVID, but I ran a DDS into it and swept up to about 700MHz on a square wave (IIRC that was the limit of our generator for square)  then looked at the FFT response to see if there were any obvious aliases as I moved the frequency up and down.  None appeared, though I suppose it's possible this test didn't capture real aliasing.

--- End quote ---

I'm not sure how you expect to observe aliasing with a fast edge like that in the mix, but I assume you'd hope to spot the 3rd harmonic reflected down at some point.  And what is the output filter BW of your DDS that can put out a 700MHz square wave? 

On your 2GHz model, perhaps try alternately feeding it 2GHz and 3GHz clean sine signals at the same amplitude. 
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