Looking for samples DUC & DDC for Cyclone II DSP board.

What kind of samples? The ones that come out of the DUC or DDC? :)

Seriously though. Did you want VHDL, Verilog, Advanced DSP Blockset, etc?

A digital downconverter or upconverter is essentially a combination of filters and numerically controlled oscillators.

Take a read of this stuff here:

http://www.ovro.caltech.edu/~dwh/correlator/pdf/esc-320paper_hawkins.pdf (http://www.ovro.caltech.edu/%7edwh/correlator/pdf/esc-320paper_hawkins.pdf)

http://www.ovro.caltech.edu/~dwh/correlator/pdf/esc-320slides_hawkins.pdf (http://www.ovro.caltech.edu/%7edwh/correlator/pdf/esc-320slides_hawkins.pdf)

Then if you want a VHDL coded example, ask, and I'll send you something. I'm coding up some examples now for a revised version of this tutorial. However, I'm working on making them Avalon components (in VHDL) so they can be wired together conveniently in SOPC Builder or Qsys. I don't have anything ready yet, but will in the next week or so.

Cheers,

Dave