1 Reply Latest reply on Jul 31, 2018 7:41 AM by weston_beal

    Hyperlynx SI with "Beads In Trace"

    tim_baestaens

      Hi,

       

      I'm currently doing SI analysis of a SERDES link for one of our customers.

      He has placed "beads-in-trace" on these lines.

       

      These things are soldermask openings, with some solder on them, so they can use these for testing.

      Although they should have a negligible impact on SI (see 4.5 in attached document), our customer would like them included in the simulation.

      Is something like this possible using Hyperlynx GHz?

       

      Best regards,

      Tim

        • 1. Re: Hyperlynx SI with "Beads In Trace"
          weston_beal

          Tim,

           

          BoardSim needs a logical pin in order to add any type of model. So if the solder beads are implemented as components then you can assign a model. They are probably one-pin components, and that presents an obstacle, but you can possibly work around that.

           

          If the solder beads are designed only as solder mask geometry then there is nothing logical to tie to a model. You would then need to export the net to LineSim, find the solder bead location in the free-form schematic, and add a capacitor at that point.

           

          Another idea is to define a 3-D area around the solder bead, edit the geometry to include the solder, and solve it in the full-wave solver. This would calculate the effect of the solder bead and automatically put the model into the net. See this short video about creating 3-D areas: https://support.mentor.com/knowledge-base/MG592355

           

          Regards,

          Weston