[SI-LIST] Re: Why crosstalk calculation does not count into trace width?

Hi Allen,
The  trace width involve in the distance "D".
Based on same configuration and just vary the trace width, I found trace width 
is relative to coupling effect.
It shows high impedance traces(thinner) have more coupling influence.
Attached file listed below for your reference.

Regards,

Jeff

-----Original Message-----
From: Allen_Wang@xxxxxxxxxxx [mailto:Allen_Wang@xxxxxxxxxxx]
Sent: Wednesday, October 22, 2003 7:06 PM
To: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] Why crosstalk calculation does not count into trace
width?


Dear all:

It's me again. Thanks Steve first to provide us good explanation of our =
last question....

We then come out another one that in crosstalk calculation, why the =
trace width does not be counted in..
For example, in Dr. Howard Johnson's first book page 192, there wrote:
Crosstalk ~ K / (1 + (D/H)*(D/H)), where D: distance between two traces =
center to center. H: height above the reference plane

In real application, a pattern of 4.5/15 (trace width 4.5 and space 15) =
will really have larger crosstalk than 5/15? (say the H is 4.1mil)

Best regards!

Allen Wang
ASUSTeK Computer Inc.
RD8- server centric division
Manager
Mobile: 886-935481831
TEL: 886-2-28943447 ext:3102
FAX: 886-2-28907689


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