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gm vs id plot for MOS transistor

Piash

I want to plot gm (y-axis) vs id (x-axis) for a transistor. Google search shows me how to plot gm/id vs vgs or gm vs vgs but not the gm vs id, i. e., the value of gm sweeping id. Can anyone help me to plot this? My testbench and the ADE analyses are given below:

 

  • Andrew Beckett

    A couple of ways:

    1. The most direct would probably be to have a current source in series with the drain of the transistor, and sweep that. The current through the current source would be the same as the drain current. Then plot the gm (e.g. using the Outputs->Save Op Point to add gm to be saved/plotted)
    2. Alternatively have a setup as you have already, and then plot both the gm and id operating point parameters, and then over the x-axis in the graph that is plotted, you can change the x-axis to be id (it will create a new graph). Essentially if you have a graph with two curves versus the independent variable, you can pick one of those curves to be the new x-axis.

    Regards,

    Andrew.

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