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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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  • BaaB
    Thank you. I appreciate your help. I am not particularly interested in this but as you may see in my other thread transconductance gm obtained from DC operating point and derivative are quite different.
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  • BaaB
    Thank you. I appreciate your help. I am not particularly interested in this but as you may see in my other thread transconductance gm obtained from DC operating point and derivative are quite different.
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