[SI-LIST] Re: REPOST: SI Question 3 of 3: Power plane fingers over split in ground plane

John-Paul,  now you need a decoupling solution.

Steve.
At 09:33 AM 10/31/2005 +0000, John-Paul Coetzee wrote:

>Reposted to try and make the diagram clearer! Last question!     ...for =
>now...
>
>Same system as described in Question 1.
>
>There is a thick power plane trace crossing this slot to provide power =
>to components in the analog zone.
>
>What are the risks of the power trace crossing the slot?  Particularly =
>with respect to degradation of noise margin in the analog zone.
>
>
>|                         #########   D I G I T A L   G R O U N D
>|                         #########
>|                         #########
>|                +-------+#########       +----------------------
>|                |       |#########       |             =20
>|                |       |#########       |         S L O T      =20
>|                |       |###   ###       |             =20
>|                |   S   |### W ###       +----------------------
>|                |       |###   ###      =20
>|                |   L   |### A ###      =20
>|                |       |###   ###
>|                |   O   |### L ###
>|                |       |###   ###
>|                |   T   |### L ###     A N A L O G   G R O U N D
>|                |       |###   ###
>|                |       |#########
>|                |       |#########
>|     --------------------#########--------------------- Analog=20
>|                         #########                      Power=20
>|     --------------------#########--------------------- trace=20
>|                |       |#########                     (thick)
>|                |       |#########
>|                |       |#########
>|                |       |#########
>|                |       |#########
>|                |       |#########
>|                +-------+#########
>|                         #########
>|                         #########
>|                         #########
>+----------------------------------------------------------------
>
>--
>JP Coetzee  (was JP Nicholls) /  jpcoetzee@xxxxxxxx
>
>Digital Design Engineer
>
>Powerwave UK Ltd
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