[time-nuts] Linear Interpolator

John Day johnday at wordsnimages.com
Thu Jul 20 23:47:21 EDT 2006


Excellent paper, nice to see some amateurs working at home-brew still!

john


At 06:54 PM 7/20/2006, you wrote:
>Hi fellow time-nuts,
>
>Stephan Sandenbergh wrote:
>
> > I also read the article posted earlier by Tom van Baak (Thanks Tom! This is
> > indeed a very comprehensive article.) It turns out that you can implement a
> > very elegant linear interpolator using a digital delay line inside a FPGA.
> > It is called the Vernier technique. From the article I understand that
> > resolutions of between 10s and 100s of picoseconds have been achieved for
> > various designs.
>
>  > Has anyone else used this Vernier technique with delay lines? I seems
>pretty
>  > neat to me.
>
>I'll take this opportunity to plug something I wrote for last year's
>UKW-Tagung (VHF-conference) in Weinheim:
>"Increasing the resolution of reciprocal counters" which shows how to
>use the Digital Clock Management feature of the Spartan series of FPGA
>to achieve a 16-fold increase in resolution, resulting in a 625ps
>resolution (1.6GHz reference) at the moment.
>This technique indeed uses a similar kind of delay-line, but integrated
>in the DCM which provides calibration and phase-shifting.
>
>http://a48046.upc-a.chello.nl/~paul/Reciproke.pdf
>
>Regards, Paul Boven.
>
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