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Joseph Hebert
04/16/13 18:41
Read: 890 times
Okemah, Ok
United States


 
#189662 - Exactly
Responding to: Andy Peters's previous message
Hi Andy,

Exactly. The distance between a signal line and its return path (e.g. return line, gnd plane, etc.) is a 1st order parameter controlling its impedance. If all the signals had to return through a common line, the impedances of the various lines would be significantly different and their individual s-parameters would be all over the place.

I said "perhaps fortuitous" in my previous post because the last time I saw a data sheet concerning such things it claimed that effect of the extra ground lines was to shield the signal lines from each other, preventing induced interference. While I have no doubt the specified configuration drastically improved the cable's performance, I doubt this explanation.

Joe

List of 19 messages in thread
TopicAuthorDate
Measuring trace impedance with a TDR?      Joseph Hebert      04/01/13 08:53      
   Maybe there's help here ...       Richard Erlacher      04/01/13 09:23      
      Thanks. Hardware/model specific      Joseph Hebert      04/01/13 10:22      
         Beauty contest      Steve M. Taylor      04/03/13 05:32      
            Growing your own      Joseph Hebert      04/03/13 16:56      
               What information do you want to extract?      Richard Erlacher      04/04/13 10:55      
                  desired information      Joseph Hebert      04/04/13 14:04      
                     "pre-loved"      Steve M. Taylor      04/05/13 12:27      
                        Pre "loved"      Joseph Hebert      04/05/13 16:40      
                        Resolution      Joseph Hebert      04/06/13 13:42      
                           ???      Steve M. Taylor      04/09/13 16:38      
                              Plenty, I'm sure, but ...       Richard Erlacher      04/09/13 21:03      
                              cost      Joseph Hebert      04/11/13 17:31      
                                 Though this is a large and cumbersome instrument ...      Richard Erlacher      04/12/13 10:24      
                     Better than standard solutions?      Oliver Sedlacek      04/08/13 01:59      
                        How do they do so?      Joseph Hebert      04/08/13 10:59      
                           Magic?      Oliver Sedlacek      04/09/13 01:43      
                           signal integrity      Andy Peters      04/16/13 15:23      
                              Exactly      Joseph Hebert      04/16/13 18:41      

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