Re: [SI-LIST] : About GNDs?

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From: ken (ken@emrinc.net)
Date: Wed Oct 27 1999 - 08:04:38 PDT


----- Original Message -----
From: Douglas McKean <dmckean@corp.auspex.com>
To: <si-list@silab.eng.sun.com>
Sent: Tuesday, October 26, 1999 5:41 PM
Subject: Re: [SI-LIST] : About GNDs?

> At 08:05 AM 10/25/99 +0900, lkd wrote:
> >Can you explane about GND Plane, Chasis GND, Shield GND, Chasis, Frame
> GND, Digital GND and relations between these?
>
> Here is my scant understanding ...
>
> Ground plane - ground reference (or datum). Could be
> in a printed circuit board, the chassis,
> a floor, an antenna grid.
>
> Chassis ground - the structure of the product being used
> as a ground reference.
>
> Shield ground - ground reference usually for a cable shield.
>
> Chassis - the structure of the product usually
> the case and any support structure
> minus anything else like PCB, power supply ...
>
> Frame ground - I've only seen this used for telephone
> circuitry in my experience. Same as
> chassis ground but used when differential
> signalling or floating secondary is used.
> Sometimes separated from the ground plane
> of a PCB with a resistor.
>
> Digital ground - ground reference on a PCB for digital circuitry.
>
> They could all be connected together to be
> electrically the same point. Or, separately
> connected in any combination thereof.
>
>
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