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How to calculate total gate capacitance of an NMOS

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skamthey

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Hi,
I m having an TSMC file.
How can i calculate the gate capacitance.:?:
 

Hi
Generally I connect the source drain and body to ground. I then give a ramp voltage say 0 to 1.2V in 1.2ps using pwl. now observe the current. I generally remains constant. C= I/(dV/dT) i.e I/(10^11). note the cap befor threshold is differernt from cap after thereshold.
 

    skamthey

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