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Oliver Sedlacek
04/09/13 01:43
Read: 957 times
Uk


 
#189640 - Magic?
Responding to: Joseph Hebert's previous message
Joe,

I've no idea how well they manage to get the PCIe connectors to perform, but the requirements are fearsomely tight on impedance and pair length matching. I don't remember the numbers off the top of my head, but the spec for pair length difference was something like 0.005 inch. As for impedance, I just told my layout guy what the goal was and he used the tool built into the layout package to come up with the trace separation and copper width for the layer stack we had agreed with the PCB manufacturer.

Oliver

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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