[time-nuts] An Excellent Tutorial on Precision Clocks

[Matt Ettus]

What I've seen is that "field solvers", which don't rely on
closed-form solutions seem to be the state of the art.

Matt

On 3/14/07, Dr Bruce Griffiths <bruce.griffiths at xtra.co.nz> wrote:
> Matt Ettus wrote:
> > 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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> >
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> Matt
>
> The formulae given in Johnson and Graham's "High speed Digital Design"
> are reliable.
>
> However there's no substitute for measurement to check your calculations,
>
> Bruce
>
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