Hi It might be easier to get into this if we put numbers on some of this. Are we after a 16X increase from 10 ps (10 ps -> 0.6 fs) or from 10 ns (10 ns -> 600 ps).
There’s a lot of range there :) Testing things like temperature dependance and noise / spurs can be challenging in some of these approaches. It is not at all uncommon to see one person look at a system and come up with a 50 ps number. Somebody else looks at it and comes up with 1 ns. Who’s right? It depends a lot on the definition of what is being tested. Bob > On Aug 12, 2016, at 7:56 AM, Paul Boven <p.bo...@xs4all.nl> wrote: > > Hi everyone, > > On 2016-08-11 21:06:12, Attila Kinali wrote: >> Hoi Bert, > >> I'm asking, because if you go the way of using a CPLD anyways, you could >> throw in another $2 for an opamp to build a time-to-amplitude converter >> (à la PICTIC II) and boost the resolutiong from 40ns to <100ps. >> As you would be measuring the PPS relative to the local clock, you >> would need only one "leg" of the PICTIC II (ie just one TAC plus a single >> ADC). > > I'd want to use the programmable logic to build a (mostly) digital > interpolation, either something along the lines of the 5370, or digital > interpolation of the clock using DCM's like I did on a Spartan-3 years ago. > On that device, I could achieve a 16-fold resolution increase by use of the > clock management devices. > > I'm currently trying to replicate my old digital clock interpolation setup on > the Xilinx/Digilent Arty board, with the aim of locking a Rb to GPS. > Another goal is to get a DDMTD going on the Arty board for clock comparisons. > > Regards, Paul Boven. > > _______________________________________________ > 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. _______________________________________________ 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.