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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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  • Pyroblast

    Hi Andrew, thanks for the reply.

    So you're suggesting to use the Vgs and Vth, from the (giving this info now) operating points saved into a file? Basically then I will have to plot the Vgs vs Vgs and the Vth vs Vgs and then compute with the calculator Vgs - Vth? The testbench can be a simple diode connected mosfet with Vgs = Vds and sweep that parameter?

    I've been told that there a lot of discussions and opinions about the Vdsat vs Vov. I have read that the Vov in small channel devices is basically equal to Vdsat. But I've heard different opinions.

    Are you able to give me some enlightenment about this?

Reply
  • Pyroblast

    Hi Andrew, thanks for the reply.

    So you're suggesting to use the Vgs and Vth, from the (giving this info now) operating points saved into a file? Basically then I will have to plot the Vgs vs Vgs and the Vth vs Vgs and then compute with the calculator Vgs - Vth? The testbench can be a simple diode connected mosfet with Vgs = Vds and sweep that parameter?

    I've been told that there a lot of discussions and opinions about the Vdsat vs Vov. I have read that the Vov in small channel devices is basically equal to Vdsat. But I've heard different opinions.

    Are you able to give me some enlightenment about this?

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