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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.

103227d1394849353-cgs-cgs-simulation-schematic.png


Below are the curves Cgs and Cgs vs Vgs.

103228d1394849364-cgs-csg.png


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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    Cgs and Csg.png
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