[SI-LIST] REPOST: SI Question 3 of 3: Power plane fingers over split in ground plane
- From: "John-Paul Coetzee" <jpcoetzee@xxxxxxxx>
- To: <si-list@xxxxxxxxxxxxx>
- Date: Mon, 31 Oct 2005 09:33:56 -0000
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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