Re: [SI-LIST] : trace to trace coupling

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From: Muhammad S. Sagarwala (msagarwa@san-jose.tt.slb.com)
Date: Fri Sep 15 2000 - 18:20:25 PDT


Hi Sean,

Could you quote an example where you saw 1Volt xtalk due to z-axis
parallelism on striplines.
I mean what was the stackup-like and what was the frequency/magnitude of the
signals.

Curious,

Muhammmad
-----Original Message-----
From: Scott McMorrow <scott@vasthorizons.com>
To: Sean Murray <seandm@mmspec.com>; si-list@silab.eng.sun.com
<si-list@silab.eng.sun.com>
Date: Friday, September 15, 2000 2:15 PM
Subject: Re: [SI-LIST] : trace to trace coupling

>Sean,
>
>Almost every frequency and edge rate today. I would never ship out
>a board without performing a crosstalk analysis on every net, especially
>those that are on adjacent stripline layers. We often see more than
>1 Volt of crosstalk from z-axis parallelism.
>
>regards,
>
>scott
>
>--
>Scott McMorrow
>Principal Engineer
>SiQual, Signal Quality Engineering
>18735 SW Boones Ferry Road
>Tualatin, OR 97062-3090
>(503) 885-1231
>http://www.siqual.com
>
>
>Sean Murray wrote:
>
>> Does anyone know the formula in order to calculate the coupling
percentage
>> between two signals seperated by a solid ground plane? At what
>> frequency/edge rate does one have to start thinking about staggering
their
>> traces so that they do not get coupling between two stripline layers..
>>
>> Regards,
>> Sean Murray
>> General Manager
>>
>> M&M Specialties Inc.
>> 1236 W. Southern Ave. #106
>> Tempe, AZ. 85282-4518
>> Phone: (480) 858-0393 x105
>> Cell: (602) 684-7859
>> Fax: (480) 858-1882
>> Email: seandm@mmspec.com
>> WWW.mmspec.com
>>
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>
>
>
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