[time-nuts] Software Sawtooth correction prerequisites?
Dr Bruce Griffiths
bruce.griffiths at xtra.co.nz
Fri May 11 22:13:31 EDT 2007
Hal Murray wrote:
>> Synchronisers can easily be built from shift registers.
> What do you mean by "synchronizer"?
> Are you talking about a delay so the times line up correctly or a
> circuit to avoid metastability?
Usually just a fast shift register with the number of stages selected to
achieve a suitably low rate of metastable states at the output.
Its usually easy to ensure that the failure rate is less than once in a
The PPS signal will not be synchronous with the local OCXO due to noise
and sawtooth error so that metastable states are possible when the PPS
is connected to the D input of a flipflop clocked by the OCXO.
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