Consistency of the glitch independent of DAC output is more important than its size. A constant amplitude glitch occurring at the dac update rate is more benign in its effect than a glitch whose amplitude varies with DAC output.
Brruce > On 16 October 2019 at 08:02 Attila Kinali <att...@kinali.ch> wrote: > > > On Tue, 15 Oct 2019 18:57:30 +0200 > Attila Kinali <att...@kinali.ch> wrote: > > > Assuming > > your OCXO has a tuning range of 1ppm (I've seen 0.1 to 20ppm for OCXOs) > > that would mean you have to controll the EFC voltage better than parts in > > 1e-9 > > or 30 bits. Yes, this is kind of unreallistic, but that's what the design > > should aim for. If you acheive something around 24bits, you will be probably > > close enough. (Note: that's 24bit resolution and stability over the > > loop time constant. It is not 24bit absolute resolution) > > Err.. correction: 1e-12 frequency control resolution with 1ppm EFC tuning > range results in 1e-6 required EFC voltage control. Which in turn is 20bits. > This is much saner requirement. > > I thought something was off when I wrote this, but I was apparently not > awake enough to realize that my calculation was wrong. Sorry about that. > > > Attila Kinali > > -- > <JaberWorky> The bad part of Zurich is where the degenerates > throw DARK chocolate at you. > > _______________________________________________ > time-nuts mailing list -- time-nuts@lists.febo.com > To unsubscribe, go to > http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com > and follow the instructions there. _______________________________________________ time-nuts mailing list -- time-nuts@lists.febo.com To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com and follow the instructions there.