[time-nuts] 1 pps sync'ing

Attila Kinali attila at kinali.ch
Fri Jun 29 10:45:02 EDT 2018


On Fri, 29 Jun 2018 16:37:41 +0200
Attila Kinali <attila at kinali.ch> wrote:

> How about just using an FPGA then? If you clock it at 200-400MHz,
> then you can built a digital phase stepper with 2.5-5ns step size.
> The FPGA can also handle the synchronization to an external pulse
> quite easily and do fault detection (like the pulse suddenly jumping)
> etc pp. 

BTW: if you have local oscillators for 10MHz and 100MHz, then it's
also possible to sync them up, by measuring their relative phase.
But all that becomes more complicated. In the end, it depends on
what the exact specs are, that you need to achieve and how much
effort you want to spend. As your PPS signal is fairly stable,
it should be doable to sync everything up to better than 10ps
(limited by how accurately the phase can be measured).

If you want to, you can contact me off-list for more in-depth discussion.

			Attila Kinali

-- 
It is upon moral qualities that a society is ultimately founded. All 
the prosperity and technological sophistication in the world is of no 
use without that foundation.
                 -- Miss Matheson, The Diamond Age, Neil Stephenson



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