[time-nuts] Help with TCXO

Bob Camp lists at rtty.us
Tue Dec 6 12:11:10 EST 2011


Hi

Actually you can get to sub ns resolution with a delay line in a modern
cheap FPGA. Weather you can get to sub 50 ps across the full window is open
to a bit of debate. 

The amount of hassle goes up as your resolution gets better. Without heroic
efforts, sub 200 ps is quite possible. 

Bob

-----Original Message-----
From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On
Behalf Of Azelio Boriani
Sent: Tuesday, December 06, 2011 10:25 AM
To: Discussion of precise time and frequency measurement
Subject: Re: [time-nuts] Help with TCXO

Yes, with an analog interpolator you can. Without an analog interpolator
and without using the vernier delay line (and other tricks like that), the
FPGA can only get to nS resolution so far (for example, in a Spartan3 or
equivalent). To implement a vernier delay line you need also to control the
logic translator and the technology fitter and know by heart your logic
chip. Maybe one day they pop up with a time-nut FPGA compiler that is aware
of intentionally-placed delay lines and stuff like this.

On Tue, Dec 6, 2011 at 3:43 PM, Attila Kinali <attila at kinali.ch> wrote:

> On Tue, 29 Nov 2011 11:23:26 +1100
> Michael Malloy <mechano at gmail.com> wrote:
>
> > let me know if you want schematics for my other designs
>
> I'm always interested in learning from others.
> So, if it would be not too much a hassle, i'd greatly
> appreciate if you could publish yous schematics/designs.
> Especially, if you can write a few words on what your
> design decisions were.
>
>                        Attila Kinali
> --
> The trouble with you, Shev, is you don't say anything until you've saved
> up a whole truckload of damned heavy brick arguments and then you dump
> them all out and never look at the bleeding body mangled beneath the heap
>                -- Tirin, The Dispossessed, U. Le Guin
>
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