[time-nuts] GPSDO PLL convergence question

Magnus Danielson magnus at rubidium.dyndns.org
Sat Aug 31 08:46:58 UTC 2013


On 08/31/2013 02:31 AM, Bob Camp wrote:
> Hi
>
> Convergence in a PLL has no absolute definition. In some cases 45 degree phase error = all is running fine. 
>
> I would simply track GPS time vs OCXO time and declare it ok when it's inside some magic number of nanoseconds. 
Exactly my thoughts. If you have sawtooth errors, then you need to look
at the average or possibly mid-point between latest min and latest max
of the phase-detector.

Cheers,
Magnus



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