[SI-LIST] Re: Cable grounding scheme

  • From: "Ihsan Erdin" <erdinih@xxxxxxxxx>
  • To: chen_jinhua@xxxxxxx
  • Date: Tue, 15 Aug 2006 06:29:32 -0400

This question makes me wonder if there're any designers left who still
separate logic ground from the chassis ground in high-speed digital circuit
design -and on what basis? I thought this whole issue of chassis vs. logic
ground was something of the past.
Regards,

Ihsan

On 8/14/06, chen_jinhua@xxxxxxx <chen_jinhua@xxxxxxx> wrote:
>
> Hi,
>
> I have a few general questions about the high speed cable grounding
> scheme. It could impact both SI and EMI. I would like to have your
> inputs about this issue.
>
> Scheme 1: cable does not separate logic ground and chassis ground. But
> when it connects the system/boards, the system/boards have separate
> logic ground and chassis ground. How do you separate/connect the logic
> ground to chassis ground in boards? What is the pros and cons for SI
> and/or EMI?=20
>
> Scheme 2: Cable keeps separate logic ground and chassis ground.
> System/boards also keep the separate logic and chassis ground. Cable
> logic ground and board logic ground connects, and chassis connects the
> chassis ground. How do you separate/connect the logic ground to chassis
> ground in boards? What is the pros and cons for SI and/or EMI?
>
> Do you prefer scheme 1 or scheme 2? What is the pros and cons of scheme
> 1 vs. scheme 2 for SI and/or EMI? Does SI and EMI have conflict
> requirements?
>
> Thanks!
>
> Jinhua Chen
> SI of Hardware Engineering
> EMC Corp.
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