2 Replies Latest reply on Jan 6, 2014 7:27 AM by cristian.filip

    S-Parameter models

    rpotluri

      Hallo Mentors,

       

      Problem1: How to get a DC solution point for S-Parameter model extracted for a power plane?.


      Problem2: why does S21 of above mentioned power plane has high low frequency loss? please find the attachment

       

      Regards,

      Ravi

        • 1. Re: S-Parameter models
          yu.yanfeng

          What is your regulator model setting?

          Btw, you have to extrapolate down to DC.

           

           

          yanfeng

          • 2. Re: S-Parameter models
            cristian.filip

            Hi Ravi,

             

            Here are some suggestions:

             

            •   Using the Touchstone Viewer you can convert S-parameters into fitted-poles models (.pls) that extend the frequency range down to 1kHz (Convert -> To Fitted Poles). This will be helpful if you youse ADMS for your subsequent simulations. In addition you can add EXTRAP TO DC=1 into the Eldo/SPICE Model Parameters window to enable ELDO to extrapolate to DC.

            • If you use HSpice adding the parameter INTERPOLATION = HYBRID will help properly extrapolate at low-frequencies.

             

            Hope this helps,

             

            Cristian