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Problem in characterizing the Vth in Cadence Calculator

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seahs

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I am going to charaterize the Vth using the following equation:
sqrt(2*I) = (Vgs-Vth)*sqrt(K*W/L).....
and I set up the variable sqrt(2*I) in the ADE. while the following error occured:

*Error* Evaluating expression (sqrt((2 * IDC("/M0/D")))).
*Error* ("times" 2 t nil ("*Error* times: can't handle (2 * nil)"))

Does it mean sqrt(0) is wrong? how to solve it?
Thanks.
 

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