Does IP3=d3IDS/dVGS3 equation is true for IP3?

Hello Friends,

Can any person tell me if this information is correct: The third intercept point IP3 is equal to the third drift of the drain to source current compared to the third drift of the gate to source voltage i.e. IP3=d3IDS/dVGS3.
If it is correct, please send me the reference of this information.


Best regards and good work.

It is related to the two tone response. The info is wrong.