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Access a family of waveforms from a corner simulation using getData

LuisGutierrez

Hi All,

I'm interested to plot some device parameters in a temperature sweep for certain process corners.

The way I proceed for a single nominal run is to include a file.scs that contains the save statements of the parameters of interest, e.g:

save M1:region

Then, I access this data by adding the expression getData("M1:region" ?results 'dc) in my outputs setup. This way I can see the operating region of M1 in the entire temperature range and when the device comes out of saturation. So far so good.

However, If I run a corners simulation, the aforementioned expression gives me eval err. Is there a way to access the family of waveforms with an expression in the output setup?

 

Regards,

Lucho

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  • Andrew Beckett

    This works for me - provided I have a dc sweep (not just a dc operating point; if it was that you would use ?result 'dcOp and you wouldn't need the save statement) and I have the instance name correctly specified (i.e. there's no additional level of hierarchy in the model files that are selected in the corners?).

    Worth looking in the results browser to see what you've got in the data that is produced by the simulator.

    One other thought - how are you referencing the file with the save statement? (BTW you can do this from the UI from IC616 ISR10/12 ish - I forget exactly when it was - in the ADE XL test editor, you'd do Outputs->To be saved->Select OP parameters). If you're adding the file in via Setup->Model Libraries, and then in the corners you are altering the model files, then the file with the save statement won't be included unless you add it to the files included via each corner. Essentially, as soon as you have model files defined as part of the corners, you don't get the model files defined in the test any more. 

    You should use a "definition file" in Setup->Simulation files instead; those are always included.

    So maybe it's just your save statement wasn't included in the netlist when running over corners.

    Regards,

    Andrew.

Reply
  • Andrew Beckett

    This works for me - provided I have a dc sweep (not just a dc operating point; if it was that you would use ?result 'dcOp and you wouldn't need the save statement) and I have the instance name correctly specified (i.e. there's no additional level of hierarchy in the model files that are selected in the corners?).

    Worth looking in the results browser to see what you've got in the data that is produced by the simulator.

    One other thought - how are you referencing the file with the save statement? (BTW you can do this from the UI from IC616 ISR10/12 ish - I forget exactly when it was - in the ADE XL test editor, you'd do Outputs->To be saved->Select OP parameters). If you're adding the file in via Setup->Model Libraries, and then in the corners you are altering the model files, then the file with the save statement won't be included unless you add it to the files included via each corner. Essentially, as soon as you have model files defined as part of the corners, you don't get the model files defined in the test any more. 

    You should use a "definition file" in Setup->Simulation files instead; those are always included.

    So maybe it's just your save statement wasn't included in the netlist when running over corners.

    Regards,

    Andrew.

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