[SI-LIST] Need technical ammunition for switching to single ground plane !
- From: "Gilles Aminot" <gilles.aminot@xxxxxxxxxxxxxxx>
- To: <si-list@xxxxxxxxxxxxx>
- Date: Fri, 21 Sep 2007 16:09:11 -0500
Hi Everyone,
I'm working on a new design and would like to eliminate split ground
planes. In the past we've always split the analog ground plane (for
analog audio circuits and codecs) and joined it at one location
(sometimes shorting or through an inductor). I've read lot's of postings
on this group explaining good reasons not to split ground planes, but
the only real supporting documentation I have seen is the following
article:
http://www.analog.com/analog_root/static/pdf/raq/RAQ_groundingADCs.pdf
<http://www.analog.com/analog_root/static/pdf/raq/RAQ_groundingADCs.pdf>
and it does not provide much depth..
I have been meeting some resistance to eliminating the split ground
planes and I am looking for technical articles showing the advantages of
using a single ground plane in designs with mixed high speed digital and
sensitve analog circuits. I keep bumping my head against datasheets or
articles that say analog & digital grounds should be separated (such as:
http://www.ultracad.com/articles/planesplits.pdf), which makes it
difficult to convince my peers that changing our approach is the way to
go. Can anyone share or point me to articles which may help me plead my
case. I would also appreciate if anyone could share some real life
experiences of going from split to single ground plane.
Kindest Regards,
Gilles Aminot, P.Eng
Hardware Design Engineer
Librestream Technologies Inc
Unit 200 - 55 Rothwell Rd
Winnipeg MB. Canada
R3P-2M5
PH: 204-487-0612 Ext 218
FX: 204-487-0914
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