[SI-LIST] Re: SPLIT PLANE GAP

When you say

"there is no effect on SI quality and timing"

do you mean

"as predicted by my SI tools"

or

"based on real-world measurements"?

Todd.

Todd Westerhoff
SI Engineer - Hammerhead Networks
5 Federal Street - Billerica, MA - 01821
email:twester@xxxxxxxxxxx - ph: 978-671-5084
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-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx
[mailto:si-list-bounce@xxxxxxxxxxxxx]On Behalf Of Goutham.S@xxxxxxxxxx
Sent: Monday, October 29, 2001 4:28 AM
To: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] SPLIT PLANE GAP





Hi
     AGTLP signals are passing over a split plane (3.3v plane Vtt plane).
Frequency of these signals is 133MHz.
Rise time & Fall times are 0.75ns, 0.9ns respectively. These signals are
routed
on BOTTOM layer (Micro strip).
3.3 v plane and Vtt plane split gap is 100mil maximum.
----------------Top layer
----------------Gnd
----------------Signal
----------------Signal
----------------3.3v & VTT (split)
----------------Bottom layer
          I have found there is no effect of split gap (25mil to 100mil) on
signal quality and timing.
We can calculate wavelength from Tr & Tf values, but what is the maximum
split
gap can be allowed for such a design?
I don't know how much it will affect EMI, can any one suggest?

regards
Goutham Sabavat






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