Geoffrey_Coram
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I'm not aware of any simulator that gives you direct access to the node charge.
You can't get Q from C because C is the partial derivative of Q and there's no (easy) way to integrate back. If you had 2-terminal nonlinear capacitors, you could integrate from 0 to v, but MOSFETs are 4-terminal nonlinear capacitors, and in many MOS models, the capacitance is non-reciprocal, so the integral would be path-dependent: the value of the integral depends on how you get from (0,0,0) to (vgs,vds,vbs)!
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