-------- 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. 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.
