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Changing a dynamic parameter set in tran and using design variables.

Namit

For one of  my transient simulations I need to change a set of dynamic parameters at a certain point in time to the design variable corresponding design variables. The simunlator allows me to do this if I select the "parameter" option under "dynamic parameter" in the tran setup menu, but not for the "parameter set". For example, if I need to change the temperature after 2us in my simulation, if I check the "dynamic parameter" option in the tran menu and select "Parameter" and then "temp" from the drop down menu, it lets me input the values in a table in a vector format and I can set the temp value to the global parameter "temp" at 2us and it works and the simulations runs fine.

But, if I try to select "parameter set' to do the same thing with more than one variable as shown below:

I get the following error:

"Unexpected open square bracket "[". Expected end of file or end of line. Cannot run the simulation because of syntax error. Correct the error and rerun the simulation."

The tran setup in "input.scs" looks like the following:

tran tran stop=5u errpreset=conservative paramset=paramSet1 \
    write="spectre.ic" writefinal="spectre.fc" annotate=status maxiters=5
 paramSet1 paramset {
time  temp  vdd
0    27    3.3
2u    temp    vdd
}

I am guessing that I need to put the dynamic variable in the parameter set in a certain syntax. Can someone please help me with this?

Thank you!

Parents
  • Andrew Beckett

    I'm not sure why you'd get an error message about unexpected open square bracket when there's no square bracket to be seen. Perhaps you experimented with adding square brackets around the parameter names?

    Anyway, this isn't supported currently. When I try it I get:

    Error found by spectre during circuit read-in.
      ERROR (SPECTRE-8525): The parameter 'vdd' in paramset 'paramSet1' cannot be
      of type string. Redefine the parameter and rerun the simulation.

    (or the same error message if I use temp in the table). The fundamental issue is that paramset definitions cannot contain parameter names. I couldn't see anyone having requested this before (well, there was one case, but it never led to an enhancement CCR for some reason). So to get this, it would need an enhancement to spectre, which if you want you'll need to contact customer support.

    Kind Regards,

    Andrew.

Reply
  • Andrew Beckett

    I'm not sure why you'd get an error message about unexpected open square bracket when there's no square bracket to be seen. Perhaps you experimented with adding square brackets around the parameter names?

    Anyway, this isn't supported currently. When I try it I get:

    Error found by spectre during circuit read-in.
      ERROR (SPECTRE-8525): The parameter 'vdd' in paramset 'paramSet1' cannot be
      of type string. Redefine the parameter and rerun the simulation.

    (or the same error message if I use temp in the table). The fundamental issue is that paramset definitions cannot contain parameter names. I couldn't see anyone having requested this before (well, there was one case, but it never led to an enhancement CCR for some reason). So to get this, it would need an enhancement to spectre, which if you want you'll need to contact customer support.

    Kind Regards,

    Andrew.

Children
  • Namit
    in reply to Andrew Beckett

    Thank you Andrew! That answers my question.

    I also got the same error as you, I just posted a different error accidentally.

    Regards,

    Namit

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