You can see that high end counters (HP53181A, PM6681, SR620 and others) claims 12 digits per second speed. That kind of performance is the result of a reciprocal counting technique and/or various type of interpolation methods. A simple counter with a 1 second timebase (like a PPS) can have 12 digits (at, say, 100MHz input frequency) only if you wait 1000 seconds.
On Thu, Dec 27, 2012 at 9:28 PM, Azelio Boriani <azelio.bori...@screen.it>wrote: > It depends on how long to wait for that last digit to be meaningful... > > > On Thu, Dec 27, 2012 at 8:12 PM, Paul Amaranth <p...@auroragrp.com> wrote: > >> Did anyone see the article in the December Silicon Chips magazine about >> building a 12 digit 2.5 GHz counter? It has an option for a GPS 1pps >> input so you could have some expectation that the last couple of >> digits mean something. The website only has the article cover page >> in pretty much unreadable type. >> >> -- >> Paul Amaranth, GCIH | Rochester MI, USA >> Aurora Group, Inc. | Security, Systems & Software >> p...@auroragrp.com | Unix & Windows >> >> >> _______________________________________________ >> 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.
