Hi There are a number of ways to build a synthesizer that do not involve a modern DDS architecture. The gotcha with a DDS in this case are the sawtooth spurs. To get them down to the 5 ps level, you would need a DDS with a clock that is well into the 100’s of GHz.
Bob > On Nov 29, 2017, at 5:47 PM, Chris Caudle <ch...@chriscaudle.org> wrote: > > On Wed, November 29, 2017 3:51 pm, Poul-Henning Kamp wrote: >> While it is tempting and probably easiest to use a DDS style >> generator, I recommend a synthesized one instead, to avoid >> trouble with numeric spurs. > > Can you describe the distinction you are making between a synthesized > generator, and a direct-digital synthesized generator? I do not > understand what would be meant by a synthesizer which is not DDS. > >> The HP3336 with its outstanding level-control is a much >> overlooked bargain for this kind of stuff. > > I looked for the manual, and it seems to have ROM feeding values to a DAC. > Is that not DDS? > > -- > Chris Caudle > > > _______________________________________________ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.