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How to edit dependent expression in ADEXL to represent specified corner sim result ?

sjwprc

Hello, suppose I have run a process corner simulation (FF, SS, TT) to find transconductance of input diff pair. I can define "Gm" as the output name. 

Then I wish to edit expression across corner  to check Gm(FF)-Gm(TT) and Gm(SS)-Gm(TT), how I can edit such expression in output setup ? 

BR

  • Andrew Beckett

    Add an output expression:

    calcVal("Gm" "AC" ?cornerName "FF") - calcVal("Gm" "AC" ?cornerName "TT")

    (note that the test name is "AC" in my case - this is the test where the Gm output is created). Set the "EvalType" column in the ADE XL outputs to be "corners" rather than the default "point" - you'll see the row in the outputs goes a sort of lilac colour when you do this.

    Of course, you can add a second output expression for the difference between SS and TT.

    Regards,

    Andrew.

  • sjwprc
    in reply to Andrew Beckett

    Done, Thanks for your reply,  Andrew. 

  • sjwprc
    in reply to Andrew Beckett

    Hi Andrew, I have a question follow up. Suppose I run temperature sweep together with corner sim, it means under each corner Gm is not a number anymore, it is a temperature dependent curve, I wish to use "value" function to extract specified temperature transconductance. But in result it outputs a "curve", but not a number. This curve is strange, it has only one point, the x-axis info is corner modelFiles. How I can show the number , or let say the y-value of that curve directly in result pane ? Thanks. 

  • Andrew Beckett
    in reply to sjwprc

    You could just take the ymax() of the result. Not sure that's necessarily the best solution here - but may be a quick answer that does the job. Might be worth following this up via customer support so you can fully explain the full setup.

    Andrew.

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