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Plotting Gm vs Vgs for different values of Vbs

wgtkan
I would like to plot Gm vs. Vgs for different value of Vbs.

Here is what I did. I performed DC sweep on Vgs and then plotted the drain current vs Vgs and then carried out derivative of ID with respect to VGS using the calculator, i.e derv(IS(drain)) to obtain GM. Then performed a parametric analysis of different values of Vbs.

Then when I did hand calculation, the result doesn’t match.

I read on this forum that first I have to do parametric analysis of Vgs and then go to ADE and tools > result browser >dc OPInfo then plot gm but it only plots one Gm vs Vgs not at different Vbs. What am I doing wrong?

I have found a tedious method where I plot Gm vs Vgs for different values of Vbs by plotting them one by one meaning I plot Gm vs Vgs at one value of Vbs and then add it to the table, then I do the same for the next.

My version is IC6.1.6-64b.500.2.1
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  • fatcat1206
    Hi Maaz

    I experience the similar situation once, and it turned out to be the structure of the model.
    For some processes, the model files have been tuned by the modeling group inside my company.
    They add one wrapper around the original model to improve accuracy, or do something they need.

    Thus for the save command, this extra layer should be introduced.
    In my case "save M0.m1:gm".

    You may consult the modeling group in your company to see whether this situation is applied to you.

    Best Regards

    Yi
Reply
  • fatcat1206
    Hi Maaz

    I experience the similar situation once, and it turned out to be the structure of the model.
    For some processes, the model files have been tuned by the modeling group inside my company.
    They add one wrapper around the original model to improve accuracy, or do something they need.

    Thus for the save command, this extra layer should be introduced.
    In my case "save M0.m1:gm".

    You may consult the modeling group in your company to see whether this situation is applied to you.

    Best Regards

    Yi
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