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tstab method in hb with mmsim12

Aldo2

Hello,

In the old versions of mmsim (now I'm using the v12) it was possible to set the method used by the initial transient (tstab). How can I set it in mmsim12?

In my simulations transient gives a correct result whereas hb/tstab predicts a strange behaviour that prevents the hb simulation to converge. Which are the default methods of the 2 analysis, tran and hb/tstab? Are there other different settings?

Thank you very much

Best regards

Aldo

Parents

  • Hi Aldo,

    As before, there's tstabmethod (on the Accuracy tab in the hb options form). From "spectre -h hb", it says:

     23      tstabmethod       Integration method used in stabilization time. The
                              default is `traponly' for autonomous circuits, or is
                              derived from `errpreset' for driven circuits. Possible
                              values are euler, trap, traponly, gear2, and
                              gear2only.

    And if I remember rightly, the settings for driven circuits match those for transient.

    That said, just because the initial tstab is running, doesn't mean that the hb will necessarily converge. Did you try using the new "auto" methods (not sure which IC subversion you're using - you have to have (I think) IC615 ISR14 or later to get that).

    Regards,

    Andrew.

Reply

  • Hi Aldo,

    As before, there's tstabmethod (on the Accuracy tab in the hb options form). From "spectre -h hb", it says:

     23      tstabmethod       Integration method used in stabilization time. The
                              default is `traponly' for autonomous circuits, or is
                              derived from `errpreset' for driven circuits. Possible
                              values are euler, trap, traponly, gear2, and
                              gear2only.

    And if I remember rightly, the settings for driven circuits match those for transient.

    That said, just because the initial tstab is running, doesn't mean that the hb will necessarily converge. Did you try using the new "auto" methods (not sure which IC subversion you're using - you have to have (I think) IC615 ISR14 or later to get that).

    Regards,

    Andrew.

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