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Howto run parametric simulations using Matlab & Spectre

marten

Hi there,


is it possible to invoke Spectre from an matlab script? Here is what I want to do:

1.) Set initial width& length of transistors for a DUT
2.) Simulate with Spectre
3.) Read back results into Matlab
4.) Calculate "new" width & length  values, jump to 2.)


How can this be done?

Cheers,
  Marten

  • Hi Marten,

    We provide a Spectre Toolbox for Matlab (covered in the MMSIM documentation) which allows you to directly read simulation results from spectre in Matlab using the cds_srr command (do a search for this).

    There's nothing we provide to run simulations from Matlab, but that ought to be fairly straightforward to write your own solution for this - it's just a matter of running a UNIX command to run the simulations.

    Kind Regards,

    Andrew.

  • I agree, but how is it possible to change for example parameters of the simulators netlist (e.g length and width of NMOS, PMOS) ?

  • One possibility is to use the cpp features of spectre. If you have this in your netlist:

    include "models.scs"

    MP1 (Y A VDD VDD) pch w=PWIDTH l=PLENGTH
    MN1 (Y A VSS VSS) nch w=NWIDTH l=NWIDTH

    VA (A 0) vsource ...

    and then you can invoke "spectre -DPWIDTH=1u -DNWIDTH=0.5u -DPLENGTH=0.2u -DNLENGTH=0.2u"

    That's the idea, anyway.

    Otherwise you'd have to build the netlist on the fly somehow.

    Regards,

    Andrew.

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