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"Transient Operating Points" can't be annotated after "tran" simulation

DavidLou

hello experts,

I don't think I had to do anything to annotate "Transient Operating Points" after "tran" sim from ADE-L. but now as I try to annotate, I see only Terminal's Transient Voltage/Currents can be annotated, but not "Transient Operating Points". not sure what I missed to have the simulation to save all the points. 

if I use "infotimes" setting like "0 250n 500n", then I only the Transient Operating Points at those time only, not arbitrarily selectable to any other time. 

IC6.1.7-64b.500.21

thanks,

David

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  • Andrew Beckett

    Hi David,

    You've never been able to annotate operating points from arbitrary times. There's an option on the transient to save the final operating point, and also infotimes as you say - but then you only have these discrete times available for transient operating point annotation. The reason is that it would need to save a lot of information otherwise...

    You can however save operating point data versus transient should you want by using Outputs->To Be Saved->Select OP Parameters - you can then choose which operating point parameters to be saved for certain devices - and do that over time or over a dc sweep. However, you can't then annotate them - but you can plot it as a curve (e.g. gm versus time) by using the OT function in the calculator (or the results browser). You can't annotate these because they are saved as waveforms in the tran database and not in an operating point database (which is a single value for each operating point).

    Regards,

    Andrew.

  • DavidLou
    in reply to Andrew Beckett
    Thanks Andrew,
    Ok, things matching up now. From my other test cases' transient simulation, I can see "Transient Operating Points" being able to annotate, which, as I understand now, supposed to be the final OP Pt then.
    but for another test case, even I have "Save Final Op Pt" checked, I still can't annotate "Transient Operating Points" which is grayed out in the schematic annotate menu.
    that's my original question why it works differently, i.e., why the saved Final Op Pt could be annotated for one test case but not the other, even I setup ADE-L all by default values. 
    thanks,
    David
  • DavidLou
    in reply to DavidLou

    hi Andrew,

    quick update. turns out my test case has verilogA code of $finish there, even it's finishing up at the exact same time as tran analysis, it couldn't keep the final Op Pt. once I remove the verilogA $finish code, it could save.

    thanks,

    David

  • Andrew Beckett
    in reply to DavidLou

    Hi David,

    I would suggest changing the $finish to $finish_current_analysis. This is less abrupt and just stops the transient rather than the entire simulation, and so the info analysis that saves the final transient operating point would execute and you can then annotate the transient operating point with no problem.

    Regards,

    Andrew.

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