[gta02-core] ECN0024 (GPS ground and layout)

Álvaro Lopes alvieboy at alvie.com
Thu Oct 8 21:14:00 CEST 2009


Werner Almesberger wrote:
> ?lvaro Lopes wrote:
>> Same guy. :)
> 
> For a moment, you had me worry that the same guy was arguing both
> sides :-)

He might aswell be :)

>> Personally I'd like to not split grounds, but to achieve the same
>> "effect" we might have to change layout a bit.
> 
> What kind of change would that be ?

Avoiding low-frequency return paths (least resistance path) crossing RF areas. Ensuring high-freq returns are not split (least impedance path).

Some references regarding this problem I found interesting:

http://www.cvel.clemson.edu/emc/tutorials/Current_Paths/Current_Paths.html
http://www.elmac.co.uk/pdfs/planes.pdf
http://www.edn.com/ednmag/archives/1995/011995/02df3.htm
http://www.pcb.ddiglobal.com/media/PWB.pdf
http://books.google.com/books?id=H4P3hZ0HKDQC&pg=PA124&lpg=PA124&dq=current+flow+%22copper+plane%22&source=bl&ots=ukWfCiGCiL&sig=-C0RD8ZCNKfdPAS1TyLE8h4bNVQ&hl=en&ei=K6PNSqbpONOgjAeTmqz2Bw&sa=X&oi=book_result&ct=result&resnum=2#v=onepage&q=current%20flow%20%22copper%20plane%22&f=false
http://pcdandf.com/cms/magazine/192/3413-effects-of-plane-splits-on-high-speed-signals-parts-1-and-2
http://emcesd.com/tt2007/tt060207.htm
http://www.commsdesign.com/showArticle.jhtml?articleID=49900228
http://www.cvel.clemson.edu/pdf/EMCS07-05.pdf

Álvaro



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