Re: [SI-LIST] : Connector pin pwr/gnd ratio

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From: Charles Grasso (chasgra@msn.com)
Date: Mon Nov 13 2000 - 13:25:22 PST


The allocation of grounds with respect to any number of signals is mainly
based
on rise time (hence frequency content). That is to say the faster the rise
time the
more grounds you need - the asymptote being a solid "bar" connection found
in many impedace controlled connectors.

----- Original Message -----
From: "Peterson, James F (FL51)" <james.f.peterson@honeywell.com>
To: <si-list@silab.eng.sun.com>
Sent: Monday, November 13, 2000 6:57 AM
Subject: [SI-LIST] : Connector pin pwr/gnd ratio

> Hello,
>
> I'm looking for some information on what the pwr/gnd ratio should be for a
> board's connector. (I know there is something in the archives, but I
> couldn't find it.)
>
> Someone said a rule of thumb is a 3 to 1 ratio, but I'm not sure what that
> is based on.
>
> So let's say for example I have 85 connector pins for 3.3v, 2.5v and gnd.
> How would you distribute? and why?
>
> thanks
> Jim
> > Jim Peterson
> > james.f.peterson@honeywell.com
> > Honeywell Space Systems
> > M/S 934-5
> > 13350 U.S. Hwy 19 N.
> > Clearwater FL, 33764-7290
> > Office : 727-539-2719
> > Fax : 727-539-2183
>
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