[time-nuts] RC TIC linearity correction?
bob at evoria.net
Wed Mar 26 20:54:32 EDT 2014
I finally got my PLL running today, and I think I can manage with just a small table of 10 values to be used as the width of my PPS jitter corrector. That takes care of it for this project, but obviously not for the general case.
> From: Chris Albertson <albertson.chris at gmail.com>
>To: Bob Stewart <bob at evoria.net>; Discussion of precise time and frequency measurement <time-nuts at febo.com>
>Sent: Wednesday, March 26, 2014 11:25 AM
>Subject: Re: [time-nuts] RC TIC linearity correction?
>Yes a lookup table would be easy. But how to create the table? I've been thinking about a way to do self calibration. The controller purposely runs the DAC and of course the OCXO through some range and watches the phase. This gives you a rough DAC vs. Phase function. Re-running the calibration could make up for some component aging. It would take some time (hours) to wait for everything to warm up and then you'd have to move the EFV voltage slowly
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