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How to plot something vs Vov

Pyroblast

Hi guys,

I am exploring the gm/id methodology.

It happens that I managed to plot gm/id vs vgs and now I would like to plot the gm/id vs vov. I tried plotting by using the calculator but I didn't get a proper result.

Then I thought that I could plot the Vdsat vs Vgs and from here try to use some cadence feature to plot the gm/id vs Vdst.

I don;t know if Vdsat is the same as Vov. Can someone confirm? Is that the correct way to do it?

What can I do plot then gm/id vs Vdsat?

Regards.

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  • Andrew Beckett

    If you're sweeping Vgs, then you could just calculate xval(Vth)-Vth (or xval of anything from the dc sweep; this will give you the x-axis of the sweep versus itself). 

    Since I've never come across Vov until I did a Google search the other day, I'm not particularly well placed. However, I would trust Geoffrey Coram's response in this thread (he would know these things) that Vdsat being similar to Vgs-Vth was probably an approximation from some very old and much simpler device models that doesn't hold true in anything recent.

    Regards,

    Andrew

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  • Andrew Beckett

    If you're sweeping Vgs, then you could just calculate xval(Vth)-Vth (or xval of anything from the dc sweep; this will give you the x-axis of the sweep versus itself). 

    Since I've never come across Vov until I did a Google search the other day, I'm not particularly well placed. However, I would trust Geoffrey Coram's response in this thread (he would know these things) that Vdsat being similar to Vgs-Vth was probably an approximation from some very old and much simpler device models that doesn't hold true in anything recent.

    Regards,

    Andrew

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