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How to add symmetric ground reference via in PCB editor 17.4?

frank673

My intention is to add reference ground return via for PCIe3 signal. The following image is the one I have added and it is not symmetric. The other image is the reference board layout, it is how my desired out should be.

Any advice on how to update my layout?

My non-symmetric layout:

Desired output in the reference design:

Parents

  • Dr. Bruce Archambeault wrote a paper for the IEEE:  "Via Asymmetry Causes Common Mode Conversion from Differential Mode Signals"

    Importance of symmetry of ground vias to minimize common-mode EMI problems.  

    Dror Haviv wrote a SignalIntegrityJournal article that show the improvement of multiple stitching vias.

    "How to stop your differential vias from leaking" 

    I think you will have fewer problems with stitching around the pairs, not splitting the pair.

Reply

  • Dr. Bruce Archambeault wrote a paper for the IEEE:  "Via Asymmetry Causes Common Mode Conversion from Differential Mode Signals"

    Importance of symmetry of ground vias to minimize common-mode EMI problems.  

    Dror Haviv wrote a SignalIntegrityJournal article that show the improvement of multiple stitching vias.

    "How to stop your differential vias from leaking" 

    I think you will have fewer problems with stitching around the pairs, not splitting the pair.

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