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About putting vias as stitching vias that disappear later on

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  • About putting vias as stitching vias that disappear later on

    Hi everyone,

    I have put a lot of vias on my design yesterday.
    I used standard vias as shielding vias.
    I didn't use the option Tools > Via Stiching Shielding.
    I find the automatic process not so good.

    Today all my vias have disappeared!

    Any idea?

    Thanks


  • #2
    I am trying the automatic process.
    AD places vias too much close from differential pairs and triggers clearance violation.

    Is there a setting to avoid this?

    Comment


    • #3
      I once had that all my ground traces and vias were gone. Probably I was deleting some test layout and pressed the tab key twice, hit delete and all was gone.
      Luckily, not that much was routed so I could copy it all from one of the backups.

      Comment


      • #4
        not really sure what happend to your design, but if you enable the pcb backup functionality it saves a copy every X minutes of your design upto a certain amount you specify so you will not loose any work i usually have it set to 3 versions with a 10 minute interval.

        Comment


        • #5
          robertferanec Robert, how do you proceed with shielding vias on 12 or 16 layers projects?
          I tried automated process but got many clearance violations.
          Doing it manually is time consuming but you have a clean job.

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          • #6
            mulfycrowh I have never used automated via placement.

            Comment


            • #7
              Is there a way in AD to add GND shielding vias based on the remaining possible locations?
              I am asking because with a 12 layers, it is very time consuming to do it manually.
              I think about the ability to define a disk centered on a via where other vias would be forbidden.

              Comment


              • #8
                The more you add shielding vias, especially on very dense design, the more you get issues with power supplies planes.
                How do you manage them?

                Comment


                • #9
                  The more you add shielding vias, especially on very dense design, the more you get issues with power supplies planes.
                  How do you manage them?​
                  - if there is no other option (e.g. bigger PCB, moving power supply closer to the load), then I try to find a compromise or sometimes e.g. under CPU, there is not really much to do.

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