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node capacitance

imagesensor123

 Hi friends,

     how do you mange to calculate the node capacitance in the circuit simulation? any node, such as the output node of the inverter, especially, i can use the captab function to print out a series of capacitance when i perform a transient simulation, the question is that this capacitance changes along with the output voltage, i want to calculate this equavelent capacitance, is it a constant value?

 welcome to any discussion.

regards,

zfeng

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