[time-nuts] DDS module

Hal Murray hmurray at megapathdsl.net
Sun Jul 21 12:10:30 EDT 2013


lists at rtty.us said:
> If the DDS is acting pretty much as a divider you don't get a lot of spurs.
> The rest of the time there are spurs *somewhere* in the output spectrum. Put
> another way, there are thousands of "bad" tuning words for every good one.
> The good ones are evenly spaced over the range at a spacing determined by
> the DAC width and the phase truncation process.  

Look at the DDS word in binary.  Bits farther to the right turn into spurs 
closer in.

The other question is how big are they.


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