[time-nuts] Help with TCXO

Azelio Boriani azelio.boriani at screen.it
Tue Dec 6 17:51:04 EST 2011


I have read the two papers about the wave union TDC but still wonder if
anything reasonable could be done without:
1) place every single gate by hand on the target silicon
2) heavy postprocess the data to obtain results
Something like: I have a Spartan3, the WebTool suite from Xilinx and, yes,
I have to tinker with the compiler configuration. Finally the data is read
by a C8051 (an MCS51-like 8 bit microprocessor). At the moment I'm in the
2.5nS resolution range and successfully made a GPSDO that my company uses
for the DVB-T synchronization needs. Next step will be to use a
Maxim/Dallas delay line to hardware correct the PPS by the negative
sawtooth and try to improve the TDC resolution. Maybe a small Virtex will
replace the Spartan...

On Tue, Dec 6, 2011 at 11:11 PM, Attila Kinali <attila at kinali.ch> wrote:

> On Tue, 6 Dec 2011 17:06:43 -0500
> "Bob Camp" <lists at rtty.us> wrote:
>
> > It's the "wave union" one that the Fermi labs papers talk about. We
> started
> > talking about a group design on one a while back. Ultimately it got taken
> > off list ....
>
> What is the status of that?
> I would try to help if i didnt know that i have way too
> little time currently :-(
>
>                        Attila Kinali
> --
> Why does it take years to find the answers to
> the questions one should have asked long ago?
>
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