[SI-LIST] Re: Need technical ammunition for switching to single ground plane !

Gilles,

It all depends on how sensitive your sensitive analog circuit is. Since you
mentioned audio, I believe that in pro audio where 24 bit converters are
used and where dynamic range reaches 120 dB and even more, so that
microvolts of noise matter, one can't achieve ultimate performance without
splitting the planes. On the other hand, from my experience, in digital/RF
applications a single ground works fine.

Ultimately, splits are not a problem, the problem is if you have a signal
trace going over a split!

/Mikhail


----- Original Message ----- 
From: "Gilles Aminot" <gilles.aminot@xxxxxxxxxxxxxxx>
To: <si-list@xxxxxxxxxxxxx>
Sent: Friday, September 21, 2007 5:09 PM
Subject: [SI-LIST] Need technical ammunition for switching to single ground
plane !


> 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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