On 24/03/14 07:12, Hal Murray wrote:
mag...@rubidium.dyndns.org said:
I did a temporary hack on the PID code to convert the D-term into I^2 term,
by integrating the integrator output. First attempt was indeed quite
resonant just to show that I was in the unsafe region. Backing down on the
strength of the component sure did remove much of the resonance, but I did
not see any appreciable improvement in filtering performance, so quick and
dirty hacking isn't sufficient, darn.
Maybe it isn't sufficient to make a great GPSDO, but it's more than
sufficient to point out the advantages of Tom's simulation setup.
Thanks Tom.
Did some home-work on third-degree PLL parameters, so now I know why I
failed, as I never tried to do it right.
One thing that Tom's simulator isn't doing is calculating the parameters
for the PID for you, or backwards what characteristics you will get.
Cheers,
Magnus
_______________________________________________
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.
