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[SI-LIST] Re: Speed Limit for dual stripline diff pairs?
- From: Doug Brooks <doug@xxxxxxxxxx>
- To: patricko@xxxxxxxxxxxxxxxxx,"SI_LIST (E-mail)" <si-list@xxxxxxxxxxxxx>
- Date: Fri, 05 Jul 2002 09:36:49 -0700
At first blush, the propagation speed is purely a function of the material
surrounding the trace. See our article on Propagation Times on our web site.
In general, microstrip traces are "faster" because the effective relative
dielectric coefficient of the material surrounding the trace is lower (see
the article).
If you start to consider capacitive loading of devices, conformal coatings,
etc., the issue can get more complicated.
Doug
At 02:15 PM 7/3/2002 -0700, Patrick O'Shea wrote:
>Gents,
>
>What is the speed threshold for the use of a dual stripline config on a
>copper interconnect <12"? Can you achieve a higher speed with a microstrip,
>or dual stripline structure, or does it really matter?
UltraCAD Design announces availability of its new book "Signal Integrity
Issues in PCB Design"
Details at www.ultracad.com
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