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Subject: Re: Resistive Ground

Date: 12/19/01 at 10:41 PM
Posted by: John Dunn - Consultant
E-mail: ambertec@ieee.org
Message Posted:

In Reply to: Re: Resistive Ground posted by Hap on 12/19/01 at 7:56 AM:


You might think so, but sometimes you're forced into their being joined. The A/D converter which that system used analog and digital grounds joined to each other. Many D/A converters do that too.

In such a case, where the two grounds are forced into being connected, avoiding ground loops becomes the necessary strategy. With the GPIB Bus, that became the problem that needed to be solved. It was by making the junction of analog and digital grounds have a finite resistance between them, low enough so that the commonality of grounding was sufficient, but high enough to minimize ground loop currents via the GPIB's own grounding.

John D.

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