RE: [SI-LIST] : Cross hatched planes

Doyle, Greg (Greg_Doyle@mentorg.com)
Fri, 18 Jun 1999 13:54:20 -0700

Fabrizio:

I'll try to remember to dig up a copy of a paper Bernie wrote on this issue.
Can you send me your mailing address?

Thanks

Greg Doyle
ICX Product Specialist
Mentor Graphics Corp.

-----Original Message-----
From: fabrizio zanella [SMTP:fzanella@fishbowl02.lss.emc.com]
Sent: Friday, June 18, 1999 1:49 PM
To: si-list@silab.eng.sun.com
Subject: [SI-LIST] : Cross hatched planes

I have a question regarding high frequency (over 500MHz) signals
running
over ground planes that are cross hatched, which is commonly done on
flex
circuits. The issue is how to accurately model the characteristic
and
differential impedance for the flex circuit traces. If, for
example, I use
a 2D field solver (where I assume an ideal ground plane) and am
designing
for 100 ohms differential impedance, what percent increase in
impedance
should I expect if the ground plane will actually be cross hatched?

thanks and regards,

Fabrizio Zanella
EMC, Hardware Engineering
fzanella@emc.com
508-435-2075, x4645

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