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Plotting BJT operating point parameters for DC sweep

Nandish123

Hello,

I am using cadence 6.1.6 and I am trying to save BJT operating point parameters such as gm, ft, beta etc during a DC sweep. I saw some cases on community forum and inserted below lines to my save.scs file and sourced it in Setup -> Simulation Files -> Definition file:

save Q0 :: oppoint

but in the result browser I don't see dc-dc folder although it is present in my psf directory.

Can you please help me with this?

Thanks.

  • Hi Nandish,

    I see "::" , is that a typo? Can you make sure you use ":" ?

     If you cannot still get the oppoint then it might be because the BJT is subckt. If that's the case then you need to include the subcktName in the save statement e.g save Q0.subcktName:oppoint. You can find it in the netlist, at the part where the BJT is instantiated. 

    Or it might be because BJT is not located at the testbench level so you need to include the hierarchical path e.g save I0.Q0: oppoint 

    You can have a look into the spectre.out log file and check for warnings, they might give a clue what the problem is.

    Also, look inside the dc folder in Results Browser to see if the oppoints are there.

    Regards,

    Dimitra

  • in reply to Dimitra Papazoglou

    Also, make sure you don't use spaces (correct syntax: save Q0:oppoint)

    Regards,

    Dimitra

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