[time-nuts] An Excellent Tutorial on Precision Clocks

[Dr Bruce Griffiths]

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