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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

    I'd not come across the term Vov before (even in my life as a designer) but a bit of light googling shows that it's Vgs-Vt - which is not the same as Vdsat (this shows up in a search for "vov voltage" too). You have vth in the operating point parameters (of bsim4 at least, as you do vgs and vdsat) so w bit of computation would allow you to plot gm/id vs (vgs-vth).

    It's amazing what Google can find...

    Regards,

    Andrew.

Reply
  • Andrew Beckett

    I'd not come across the term Vov before (even in my life as a designer) but a bit of light googling shows that it's Vgs-Vt - which is not the same as Vdsat (this shows up in a search for "vov voltage" too). You have vth in the operating point parameters (of bsim4 at least, as you do vgs and vdsat) so w bit of computation would allow you to plot gm/id vs (vgs-vth).

    It's amazing what Google can find...

    Regards,

    Andrew.

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