[SI-LIST] Re: REPOST: SI Question 3 of 3: Power plane fingers over split in ground plane
- From: steve weir <weirsi@xxxxxxxxxx>
- To: jpcoetzee@xxxxxxxx, <si-list@xxxxxxxxxxxxx>
- Date: Mon, 31 Oct 2005 10:02:10 -0800
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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