> Hene we would need a DAC resolution of 1e-4 or 14bit. That's already a DAC that has a price > tag, multiple times that of the TCXO.
I'm not sure what you consider "low cost' but a 16 bit DAC like the MAX5216BGUA+ <https://www.mouser.com/ProductDetail/Maxim-Integrated/MAX5216BGUA%2b?qs=sGAEpiMZZMswix2y39ylddFcA27kRSR8c6%2fDlE45lrQ%3d> goes for $3.40, quantity one. Wayne On Tue, Aug 14, 2018 at 2:33 PM, Attila Kinali <att...@kinali.ch> wrote: > On Tue, 14 Aug 2018 11:05:17 -0400 > Bob kb8tq <kb...@n1k.org> wrote: > > > > Is there a need to make the math easier? > > > This is what we have microprocessors for. > > > > There is *always* a need to make the math easier if I’m quickly typing > up an example. For proof I > > reference the hundreds of posts in the archives where I didn’t quite get > it right :) > > I am pretty sure that the math is less the problem than being able > to control the oscillator precisely enough while staying at low cost. > > The average TCVCXO has a tuning range of...let's say 10ppm = 1e-5 > over a range of 0-3V. Now, we want to be able to shift the phase > such, that we are within 1ns at the next pulse (actually we want it > to be better, but lets keep the numbers simple). This means we need > to control the frequency with a precision of 1e-9. Hene we would need > a DAC resolution of 1e-4 or 14bit. That's already a DAC that has a price > tag, multiple times that of the TCXO. Hence it's cheaper just to > shift the frequency/phase digitally and not touch the TCXO. > > > Attila Kinali > -- > It is upon moral qualities that a society is ultimately founded. All > the prosperity and technological sophistication in the world is of no > use without that foundation. > -- Miss Matheson, The Diamond Age, Neal Stephenson > > _______________________________________________ > 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.
