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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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  • FormerMember
    FormerMember

    Dear Andrew,

    I have tried to plot gm out of a DC sweep analysis using this method but without success. Here is what I've done:

    create an .scs file with the statement "save M0:gm" (also tried with "save M0:all")

    Included this file into my ADE design via  Setup -> Model libraries

    run the simulation and look at the Results Browser (Tools -> Result Browser): the dc tab shows only voltages and currents but not the parameters (gm and others)

    I have also tried to include the file via Setup -> Simulation files -> Definition files (or tried both) but with no success

    What am I doing wrong?

    Thanks

Reply
  • FormerMember
    FormerMember

    Dear Andrew,

    I have tried to plot gm out of a DC sweep analysis using this method but without success. Here is what I've done:

    create an .scs file with the statement "save M0:gm" (also tried with "save M0:all")

    Included this file into my ADE design via  Setup -> Model libraries

    run the simulation and look at the Results Browser (Tools -> Result Browser): the dc tab shows only voltages and currents but not the parameters (gm and others)

    I have also tried to include the file via Setup -> Simulation files -> Definition files (or tried both) but with no success

    What am I doing wrong?

    Thanks

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