Re: [SI-LIST] : Connection of different ground

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From: Mike Hughes ([email protected])
Date: Tue Feb 20 2001 - 10:59:38 PST


Dr. Howard Johnson's column in EDN magazine covered this topic a few weeks back.
Sorry but I don't remember the exact issue. (you may be able to find it through Basically he was saying that you can split the ground planes for
analog and digital to keep digital noise out of the analog sections, but the
ground planes should be connected at the location of the ADC's and DAC's (and
the connector for your application). I have found that this works good in
practice, but I can't explain it as good, so the article is definitely worth


> Kai Siang wrote:
> I am currently designing a board which requires both video analog
> circuitry(this includes ADCs and DACs) and digital controller circuitry. I
> plan to split from the same power lines (coming from the connectors)two power
> planes, analog and digital power. What i am not so sure now is the connection
> of the ground. Since at the connector side there is only one ground, how
> should i allocate the ground on the board ? Do i split the ground plane
> according to digital and analog plane and join them near the connector?

Mike Hughes   
Product/Test Engineer      
Analog Devices, Inc. 
Phone 781-937-2370
Fax 781-937-1011

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