2 Replies Latest reply on Jul 30, 2018 8:22 AM by tim_baestaens

    Hyperlynx VX.2.3 AC couple caps 3D model extraction

    tim_baestaens

      Hello,

       

      I have found some similar topics, but none give me the answer I'm looking for, nor any of the help files...

      Well, I want to simulate a SERDES link, routed completely on TOP, but with AC couple caps.

      The AC couple caps are broadband caps 530L104KT16 caps for which I have a touchstone model.

       

      So for simulation, I want to extract a local 3D area as follows:

      The model gets created alright, but I cannot view it as I don't have the required licenses.

       

      When I translate my whole net to FFS, and after manually adjusting input/output driver models and packag models I get this:

       

       

      And more specifically, this on the 3D model part:

      So he created the 2 AC couple caps (100nF) alright, but instead of having 4 ports for these, they are each connected to 1 port (port 5 & 6) and then connected to GND.

      If I simulate this, I'm getting good results (I guess?), but I can't get my head around the grounding of 1 side to the AC couple caps.

       

      Can somebody explain this behavior?

       

      greets,

      Tim