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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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  • wgtkan

    Dear Andrew:

     I created an include file using a text editor in my case (gedit) and saved is as save.scs which contains save T1:gm the name of my transistor is T1.

     

    I included this in ADE via Setup-> Model Libraries. First I did a dc sweep of Vgs from 0 to 1.5 in a linear step Mode of total 100 points. Then I did and a parametric analysis of

    values: Vbs1=-1, Vbs2=-0.75, Vbs3 = -0.5, Vbs4 = -0.25, and Vbs5 = 0. Then I went to ADE->Tools->Results browser->dc->T1/gm -> plot.

    I got it.

     

    Thank you very much indeed.

     

Reply
  • wgtkan

    Dear Andrew:

     I created an include file using a text editor in my case (gedit) and saved is as save.scs which contains save T1:gm the name of my transistor is T1.

     

    I included this in ADE via Setup-> Model Libraries. First I did a dc sweep of Vgs from 0 to 1.5 in a linear step Mode of total 100 points. Then I did and a parametric analysis of

    values: Vbs1=-1, Vbs2=-0.75, Vbs3 = -0.5, Vbs4 = -0.25, and Vbs5 = 0. Then I went to ADE->Tools->Results browser->dc->T1/gm -> plot.

    I got it.

     

    Thank you very much indeed.

     

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