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November 2003

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Subject:
Re: more controlled impedance..
From:
David Hoover <[log in to unmask]>
Reply To:
David Hoover <[log in to unmask]>
Date:
Mon, 17 Nov 2003 19:41:49 -0800
Content-Type:
text/plain
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text/plain (84 lines) 
Sergio,

Just break them up into two sets of dual striplines.

L1 ========
       ^        ^
L2  ==       |
L3    |       ==
        |         |
L4    |       ==
L5  ==       |
       v         v
L6 ========

Don't forget to include the absent trace thicknesses into the
dielectric calculations.
Now I hope the designer has laid out the traces on each layer to be
different
directions so the cross overs provide a minimal amount of crosstalk (Xtalk).
Like one layer North and South, another east and west, and the other two 45
degrees of each other.

Good luck,

David Hoover

http://home.earthlink.net/~dhoovy
----- Original Message -----
From: "Sergio T. Ruiz" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Monday, November 17, 2003 9:18 AM
Subject: [TN] more controlled impedance..


> i have another controlled impedance question that is baffling me..
>
> of all the jobs that we have run, the configuration we have used has
always
> been a textbook situation including striplines, dual striplines, embedded
> microstrips, and the like..
>
> now, i have one that i am looking at that doesn't look like anything i
have
> ever seen..
>
> just as in the dual stripline model, there are traces embedded between
> ground planes, but in this case, there are four sets of traces embedded
> between the two planes..
>
> does anyone have any ideas on how to handle this model?
>
> thanks!
>
>
> ____
> Sergio T. Ruiz
> technology and MIS
> Philway Products, Inc.
> (419) 281-7777 x232
>
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