[time-nuts] Comparing Reference Accuracy

Bruce Griffiths bruce.griffiths at xtra.co.nz
Fri May 23 02:06:32 EDT 2008

Stanley Reynolds wrote:
> Bruce
> Some references I found.
> http://findarticles.com/p/articles/mi_m0HPJ/is_n1_v40/ai_7113244/pg_5
Good article, but the HP5371 only has 200ps resolution this is inadequate.
>  http://iram.cs.berkeley.edu/serialio/cs254/interpolator/interp.html
Somewhat impractical to interpolate between buffer delays in this way if 
you want to make your own.
A stochastic TDC has much higher resolution. However its dynamic range 
is very small.

> http://www.dspguru.com/info/faqs/multrate/interp.htm
This has to do with digital signal processing not interpolating within a 
clock cycle.
> http://www.freshpatents.com/Phase-interpolator-based-pll-frequency-synthesizer-dt20070517ptan20070110207.php
Not directly relevant as it is about using a phase rotator in a PLL 
feedback path.
> http://tycho.usno.navy.mil/ptti/1994/Vol%2026_22.pdf
This is about NIST's FMAS remote frequency measuring system which 
employs a dual ramp interpolator.
The dual ramp interpolator is just one of many ways of building dual 
ramp interpolators.
Modern TACs and Wilkinson style dual ramp interpolator ASICs achieve 
picosecond resolution.
> http://www.mwrf.com/Articles/Index.cfm?Ad=1&ArticleID=12529
You should go to the Pendulum site and read the articles there.
> http://findarticles.com/p/articles/mi_m0HPJ/is_n1_v40/ai_7113244/pg_5
Another article on the HP5371A.
> Stanley

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