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Why gm is not zero even when iDS is a constant DC current?

BaaB

I am trying to plot transconductance gm of M0 in the picture below. However, what I am supprised here is why gm is not zero when iDS is a constant DC current (1uA).

gm = diDS/dvGS

So according to this, gm should be zero when iDS is a constant.

As seen from the picture below, gm is not zero.

Could anyone explain why and how gm is calculated by the simulator?

Thank you.

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  • Andrew Beckett

    No, I will not have the time to sit and wade through Berkeley's BSIM code to answer this. Unfortunately I have enough real-world design/tool problems to worry about and can't allocate time to look at this. Please contact the Berkeley BSIM group (particularly since you're from a University) if you want more information about the specifics of their model implementation.

    Sorry if that's a bit blunt, but given my limited bandwidth (especially this month), I've already gone beyond what help I can afford to offer on this.

    Kindest Regards,

    Andrew.

Reply
  • Andrew Beckett

    No, I will not have the time to sit and wade through Berkeley's BSIM code to answer this. Unfortunately I have enough real-world design/tool problems to worry about and can't allocate time to look at this. Please contact the Berkeley BSIM group (particularly since you're from a University) if you want more information about the specifics of their model implementation.

    Sorry if that's a bit blunt, but given my limited bandwidth (especially this month), I've already gone beyond what help I can afford to offer on this.

    Kindest Regards,

    Andrew.

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