[SI-LIST] Re: Ground, the preferred reference plane

  • From: Chris Cheng <chris.cheng@xxxxxxxxxxxx>
  • To: "'si-list@xxxxxxxxxxxxx'" <si-list@xxxxxxxxxxxxx>
  • Date: Wed, 11 Dec 2002 20:17:07 -0800

I still don't understand what are you talking about. Almost all the high
performance package I've design or  came across have mulitple planes.
Sandwiching I/O signal between Gnd and VDDQ is simple to do and common
practice. Are you telling me there should be no power planes on a package
because there is potential DC shorting issue ?

-----Original Message-----
From: Michael J. Degerstrom [mailto:degers@xxxxxxxxxxxxxxxxxxxx]
Sent: Wednesday, December 11, 2002 6:00 PM
To: chris.cheng@xxxxxxxxxxxx; 'si-list@xxxxxxxxxxxxx'
Subject: [SI-LIST] Re: Ground, the preferred reference plane

Also, please note in my original posting my explanations of the two
different 
meanings of the term 'reference'.  When I spoke about packages, I was 
speaking on the second meaning of 'reference'.  That is, if you are going to

change the voltage reference of a part, for example, running ECL as PECL, 
then there are other things to be concerned with beside high-speed issues.  
My example points out that large pieces of metal that were grounded now
would 
be at the PECL voltage - which could be a potential DC shorting issue.  I
was 
by no means advocating not using power or ground planes in a high speed 
package.

Mike
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