I posted a link to some plots of phase and amplitude
truncation/quantization
spurious "pileups" here a while back:
http://febo.com/pipermail/time-nuts/2009-October/041545.html
"
" Even when not multiplied, the normal close in phase noise floor of
" the DDS can be masked by spurs and intermods near many tune words.
"
" I put together some plots of this a few years back, modeling just the
" numerical spurs ( phase truncation and and amplitude quantization )
but
" _not_ the harmonically related intermods, near some 'pile-up'
frequencies.
"
" There are a few off-by-two errors in here that I need to fix, but
" the plots still illustrate the problem well ( put Acrobat in single
" page mode and mouse wheel scroll to 'animate' the plots ) :
"
" http://fpgastuff.googlepages.com/dds_oddities.pdf
"
Those plots were generated in the context of a discussion about the
effects
of these close in DDS spurious when used as the reference for a PLL:
http://groups.yahoo.com/group/spectrumanalyzer/message/1027
http://groups.yahoo.com/group/spectrumanalyzer/message/1038
Brian
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