[time-nuts] Question for my new GPSDO

[Bruce Griffiths]

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 <attila at kinali.ch> wrote:
> 
> 
> On Tue, 15 Oct 2019 18:57:30 +0200
> Attila Kinali <attila at 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 at lists.febo.com
> To unsubscribe, go to http://lists.febo.com/mailman/listinfo/time-nuts_lists.febo.com
> and follow the instructions there.