RE: [SI-LIST] : Effects of thieving on SI and EMC.....

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From: Greim, Michael (mgreim@mc.com)
Date: Tue Aug 08 2000 - 11:45:55 PDT


A thieving pattern is a bunch of very small shapes
added to a layer that helps equalize the plating
across a given layer (increases manufacturability).
An auto thieving utility or program uses a set of
criteria to determine how and where to put these
shapes. Unfortunately these programs are almost
exclusively focussed on mfg issues and not SI or
EMC issues.

Usually if you see a bunch of 1/16" width diamonds
on an artwork layer, this is thieving.

FYI

MG

-----Original Message-----
From: Ray Anderson [mailto:raymonda@radium.eng.sun.com]
Sent: Monday, July 31, 2000 11:12 AM
To: Greim, Michael
Cc: SI LIST
Subject: Re: [SI-LIST] : Effects of thieving on SI and EMC.....

OK, I'll bite. Educate me, what is a thieving pattern,
and an auto-thiever ????

-Ray

> Does anyone out there have a tool or reference
> that would allow one to calculate the effects of
> thieving patterns on signal integrity and EMC.
>
> I am trying to come up with appropriate rule sets
> for driving an auto-thiever utility.
>
> Thanks for the help.
>
> MG
>


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