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Component parameter DC Sweep

FormerMember
FormerMember

I found the following thread trying to troubleshoot my problem:

https://community.cadence.com/cadence_technology_forums/f/rf-design/21507/working-with-dc-sweeps-and-op

I am trying to do the same thing shown here except I am trying to plot a device in a lower level of the hierarchy. I've created a save.scs file with the following lines:

save I0/Mcp:oppoint

save I0/Mbp:oppoint

I go to Setup -> Model Libraries and add the save.scs file to my global model files. I perform a DC sweep where I am sweeping the length of the device Mcp listed in the save.scs file but I am unable to get Cadence to evaluate the expression getData("I0.Mcp:gm" result 'dc). Cadence says the expression evaluates to nil. I'm running version 6.1.7.

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  • Andrew Beckett

    Hi Kevin,

    Two things. First of all, the hierarchy separator in spectre needs to be "." not "/". The forward slash is what is used in Virtuoso, but not in spectre, which needs a dot. So it would be save I0.Mcp:oppoint. Secondly, in ADE you have Outputs->To be saved->Select OP Parameters which allows you to point at the device and specify which operating point parameters to save rather than having to use an include file. The include file approach is only really needed in older versions, or if the device you're referencing is within a subckt model that isn't available from the schematic. Thirdly (didn't I say "two things"?), you need to check if there is hierarchy in the models below Mcp/Mbp - if that's a subckt, you may need to refer to the actual transistor inside to save the operating point.

    Regards,

    Andrew.

  • FormerMember
    FormerMember in reply to Andrew Beckett

    It was the first part that was tripping me up, changing the "/" to a "." solved the issue. That's great that saving operating point parameters is now built into ADE, it will make my life much easier!

    My company has just caught up with the times and I am just starting to use IC6 instead of IC5 so I'm still getting used to the new interface. Thank you for your help.

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  • FormerMember
    FormerMember in reply to Andrew Beckett

    It was the first part that was tripping me up, changing the "/" to a "." solved the issue. That's great that saving operating point parameters is now built into ADE, it will make my life much easier!

    My company has just caught up with the times and I am just starting to use IC6 instead of IC5 so I'm still getting used to the new interface. Thank you for your help.

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