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Re: [BP] Interference tolerance test channels

Would it not be better to match the attenuation curve with frequency to measured S-Parameter
data for a typical channel and make minor adjustments from there?
 
It would be unnecessary to make differential measurements because a single ended line
will have the same attenuation as a differential line.  So single ended measurements
can be used for characterizing the attenuation of differential lines in the same material.
 
So, a standard vector network analyzer can be used.
 
A further fall-out from this will be that the group delay can also be measured and
characterized in the model of the line further refining the accuracy of the model.
 
Ron Miller

From: Joe M Abler [mailto:abler@US.IBM.COM]
Sent: Monday, January 16, 2006 10:15 AM
To: STDS-802-3-BLADE@listserv.ieee.org
Subject: Re: [BP] Interference tolerance test channels


The new channel appears to be inline with what we stated - a tilt of the line from DC to about a 3dB drop at 5GHz.  Why do you feel the lower frequencies need to stay fixed?


Thanks,        Joe


Joe Abler                                                             abler@us.ibm.com
IBM Systems & Technology Group            919-254-0573
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"Mellitz, Richard" <richard.mellitz@INTEL.COM>

01/16/2006 10:41 AM
Please respond to "Mellitz, Richard"

       
        To:        STDS-802-3-BLADE@listserv.ieee.org
        cc:        
        Subject:        Re: [BP] Interference tolerance test channels



Hi Charles,
DC and low freq's went down way to much! Can you create a model with the
same losses at say 1GHz or so and 2 dB less at 5GHz? I thought that's
what we agreed.
... Rich

-----Original Message-----
From: Charles Moore [mailto:charles.moore@avagotech.com]
Sent: Friday, January 13, 2006 8:42 PM
To: STDS-802-3-BLADE@listserv.ieee.org
Subject: [BP] Interference tolerance test channels

guys,

    I propose that we use the model ITTC_23.s4p for reduced attenuation
EIT modeling.  If it really will not work, ITTC_20.s4p is available as a
bail out channel.  If it looks too easy, let me know and i will step it
up just
a tad.

    The numbers refer to the fitted attenuation at 5.15...GHz.

                                 charles

--
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|       Charles Moore
|       Avago Technologies
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