Hi > On Jun 10, 2017, at 5:15 PM, Poul-Henning Kamp <p...@phk.freebsd.dk> wrote: > > -------- > In message <b90b65d3-5e09-4c1c-ade1-100a0a26d...@n1k.org>, Bob kb8tq writes: > >> If you want the controller noise to *not* be the limiting factor at an ADEV >> floor of 1x10^-12, >> that drives you to a noise floor of < 0.1 mK. You can then work through the >> various thermal >> gains to come up with a level of DAC bits that you need. You could equally >> as well decide >> on a 1x10^-13 floor and / or might have a 1x10^-9 sensitivity.
Sounds like a sound plan. Bob > > Which gets us back to what SRS does for low noise: > > Implement the low noise stuff, the PI(D) loop, in analog, but > tune/calibrate/adjust the analog circuitry with DAC's set (infrequently) > by a uC. > > -- > Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 > p...@freebsd.org | TCP/IP since RFC 956 > FreeBSD committer | BSD since 4.3-tahoe > Never attribute to malice what can adequately be explained by incompetence. _______________________________________________ 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.
