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Problem in taking derivative in calculator

BaaB

I have a common source amplifier and I run DC analysis with Vgs swept. Then I plot Vds and Ids vs Vgs.
Next from the ViVA I choose Y vs Y to plot Vds vs Ids.
Until now everything is OK. However, now I want to plot dVds/dIds (d is derivative here).
I sent the line Vds vs Ids to the calculator but it doesn't work. The calculator shows nothing.
Could you help me with this?

Parents
  • Thank you. I've just tested it and it worked. My purpose is to check if rout in operating point parameter is defined as dvds/dids. However, the result is something totally different. I see that ron = Vds/ids but rout is almost equal to ron. But rout is not equal to dvds/dids at all.
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  • Thank you. I've just tested it and it worked. My purpose is to check if rout in operating point parameter is defined as dvds/dids. However, the result is something totally different. I see that ron = Vds/ids but rout is almost equal to ron. But rout is not equal to dvds/dids at all.
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