[time-nuts] 2.5 Ghz 12 digit counter project
azelio.boriani at screen.it
Thu Dec 27 20:35:15 UTC 2012
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.boriani at 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 <Paul at 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
>> paul at AuroraGrp.Com | Unix & Windows
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