[SI-LIST] Re: Routing Signals Between PWB Layers
- From: steve weir <weirsi@xxxxxxxxxx>
- To: doug@xxxxxxxxxx,emc-pstc <emc-pstc@xxxxxxxx>, SI-List <si-list@xxxxxxxxxxxxx>
- Date: Fri, 07 Apr 2006 03:15:19 -0700
Doug, I think that is an excellent example of how changing
coefficients sufficiently changes basic behavior. The results of
this experiment contrast starkly to a different recent experiment
where there was virtually no detectable difference between the
results with the contiguous track and the layer switching track. In
that experiment there were many layers with all the ground layers
stitched together acting in parallel with the displacement currents
through most of the cavity. And instead of an ESD spark to the plane
cavity, the stimulus was a TDR to the test track. It might be
interesting to see how much the situation in your ESD susceptibility
test can be improved with a well designed bypass network.
Regards,
Steve.
At 08:38 PM 4/6/2006, Doug Smith wrote:
>Hi All,
>
>My article is a little late this month due to travel, but it is done
>now and many of you may find the data/discussion/audio file interesting.
>
>A signal that passes through multiple layers, especially from the top
>layer to the bottom layer of a four layer board, can see significant
>impairment. An ESD example to illustrate the magnitude of the problem
>is given.
>
>Abstract: Printed wiring board, PWB, signal paths must often change
>layers in a board stackup. Under some conditions this can cause
>problems. An ESD example is used to illustrate the conditions where
>changing layers can cause problems.
>
>The link to the article is the drawing of a signal changing layers at
>the bottom of the home page at http://emcesd.com .
>
>There is also an audio discussion of this article on my podcast site:
>http://emcesd-podcast.com where the direct link to the article is:
>
>http://emcesd-podcast.com/2006/april/2006-0406.mp3
>
>Can't download mp3 files? Download the following instead:
>
>http://emcesd-podcast.com/2006/april/2006-0406.dcs
>
>After download, change the extension from .dcs to .mp3 and the file
>will then be able to play on most computers.
>
>There are many such discussions on my podcast site. I have enough
>bandwidth for about a quarter of a million downloads per month of my
>mp3 technical podcasts so feel free to browse the site and listen to
>anything you find useful.
>
>Have a good month,
>
>Doug
>
>--
>-------------------------------------------------------
> ___ _ Doug Smith
> \ / ) P.O. Box 1457
> ========= Los Gatos, CA 95031-1457
> _ / \ / \ _ TEL/FAX: 408-356-4186/358-3799
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>| q-----( ) | o | Email: doug@xxxxxxxxxx
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>-------------------------------------------------------
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