[time-nuts] An Excellent Tutorial on Precision Clocks

Matt Ettus boyscout at gmail.com
Thu Mar 15 01:40:34 EDT 2007


I was just investigating this very issue.  It seems that every program
you use to compute these impedances comes up with different answers,
sometimes wildly different.  Anyone have a free program they trust
with this sort of thing?

Matt

On 3/14/07, Dr Bruce Griffiths <bruce.griffiths at xtra.co.nz> wrote:
> Tom Clark, K3IO wrote:
> >    I just stumbled on an excellent tutorial on low-noise clocks --
> >    National Semiconductors free downloadable "[1]Clock Conditioner
> >    Owner's Manual". This 88 page document is a 3.7 MB PDF.
> >    73 de Tom, K3IO
> >
> > References
> >
> >    1. http://www.national.com/appinfo/interface/files/clk_conditioner_owners_manual.pdf
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> >
> Tom
>
> Not bad except they give inaccurate formulae for stripline and
> microstripline characteristic impedance.
> Will these inaccurate formulae ever go away?
> They've been around since the 1970's.
> When with the trace widths and board thickness then in use the accuracy
> wasn't too bad.
> However they are not very useful for modern PCB design.
>
> Bruce
>
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