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EAGLE User Support (English) Differential routing / meander issues
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Forum Thread Details
  • State Not Answered
  • Replies 7 replies
  • Subscribers 179 subscribers
  • Views 2142 views
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  • eagle
  • meander
Related

Differential routing / meander issues

Former Member
Former Member over 10 years ago

I'm trying to use the Meander function to route a differential pair. The pair is named D7_P and D7_N. Using the "run length d7*" command I can see that one trace is 234 mm long and one trace is 238 mm long. I use the command "meander 238mm" and select the pair. I click on either P and N and the move the mouse so both traces meander until the percents read "100.0% 100.0%." However, as is obvious from what the traces are doing and confirmed by "run length d7*" the wrong trace is being extended. The result of the new "run length d7*" is now something like 241 and 252 - the meander made the difference BIGGER!

 

So, am I doing something obviously wrong? I will say that I do have some intermediate pads involves (i.e. this is USB and there is an ESD chip connected to both traces). Does this screw things up? Is this just something I have to wing by hand? Please help!

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  • Former Member
    0 Former Member over 10 years ago

    This should hopefully make things more clear. The command I execute to get the trace lengths is "run length d7*". I believe the results because the routing off screen makes D7_P slightly longer. However, when I actually execute the meander command Eagle thinks that D7_P is SHORTER and so rather than balance the two traces it actually makes the imbalance WORSE.

     

    image

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  • clem57
    0 clem57 over 10 years ago in reply to Former Member

    Here is a video doing something like you did. He did make a mistake and canceled out. Your picture shows the left side not following the top which is a mistake!

    Clem

    Edit: added link

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  • Former Member
    0 Former Member over 10 years ago in reply to clem57

    Where is the link to the video? Are you saying Eagle is doing something wrong, or am I doing something wrong?

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  • Former Member
    0 Former Member over 10 years ago in reply to clem57

    Where is the link to the video? Are you saying Eagle is doing something wrong, or am I doing something wrong?

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