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gm/id with modern cadence virtuoso

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Hello, I am trying to create an expression which is a combination of regular currect with OP gm.  f(gm/id,vgs)

All the manuals which i found are envolving a file system manipulation for creating such expression,probably because they worked with old version.

I made Id vs gs DC sweep and I have tried to create such expression using calculators OP button and dividing it which the Id current expression shown bellow.

It gives me eval error although its a straight forward dividing.

Where did i go wrong?

Thanks.



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