Cgs and Cgs with bias voltage Vgs

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anhnha

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Hi.
I set up this circuit for simulation Cgs and Cgs as Vgs changes.



Below are the curves Cgs and Cgs vs Vgs.



I have some questions, hope you can help.

1. Why Cgs and Cgs are negative?
2. Why Cgs and Csg are not equal?
Thanks.
 

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