[SI-LIST] Re: risetime effects of plane breaks
- From: "Lee Ritchey" <leeritchey@xxxxxxxxxxxxx>
- To: "Doug Smith" <doug@xxxxxxxxxx>, "SI-List" <si-list@xxxxxxxxxxxxx>
- Date: Sun, 9 Jan 2005 16:30:33 -0800
Just noticed that you call a 5 cm break relatively small. Does that mean
5 cm in width?
Lee W. Ritchey
Speeding Edge
P. O. Box 2194
Glen Ellen, CA 95442
Phone- 707-568-3983
FAX- 707-568-3504
I just used the energy it took to be angry to write some blues.
Count Basie
> [Original Message]
> From: Doug Smith <doug@xxxxxxxxxx>
> To: SI-List <si-list@xxxxxxxxxxxxx>
> Date: 1/8/2005 5:23:26 PM
> Subject: [SI-LIST] risetime effects of plane breaks
>
> I think most of us know not to route signals over plane breaks on PWBs
> as all kinds of bad things can happen when this occurs in a layout.
> But, how do you convince co-workers or your boss that a new design
> needs to avoid doing this even if added expense or project delay is
> required? Experimental data can be the key and this month my Technical
> Tidbit shows what happens to signal risetime if the signal crosses a
> plane break.
>
> Crossing Ground Plane Breaks - Part 4
> Risetime Effects on Signals
>
> Abstract: Signals that cross ground plane breaks on printed wiring
> boards (PWBs) experience degradation as well as cause EMI problems.
> Significant degradation of signal risetime is shown to occur, even
> with a relatively small ground break of five cm at risetimes on the
> order of 300 ps.
>
> The link to the article is the picture of the experimental test setup
> at the bottom of the home page at http://emcesd.com .
>
> Doug
> --
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> ___ _ Doug Smith
> \ / ) P.O. Box 1457
> ========= Los Gatos, CA 95031-1457
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