Re: [SI-LIST] : Grounding strategies for instrumentation

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From: Michael Nudelman (mnudelman@tellium.com)
Date: Mon Nov 13 2000 - 14:27:20 PST


If you could elaborate on structure of your device a little...is it bunc of
mixed a/d circuits, or Analog separately from Digital?

Mike.

Lyke James Civ AFRL/VSSE wrote:

> I am involved with a painful situation in which we have to mix high-speed
> digital with sensitive instrumentation in an infrared sensor and mirror
> control servos. In instrumentation, there is a very strong emphasis on
> single point grounds, but for the nearly 100 processors and 16,
> 1-gigabit/second links inside the same system, a different set of
> philosophies emerge, in which in order to make the transmission line
> structures function correctly, etc. we must deal with keeping the ground
> impedances low through a multiplicity of ground contacts. This violates the
> first idea about a single point ground.
>
> How can these philosophies be reconciled within a single system?
>
> jim
>
> JIM LYKE, AFRL/VSSE
> lyke@plk.af.mil, 505-846-5812/5815
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