Geoffrey_Coram
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rgatemod=2 and 3 have two resistances, a constant "electrode" resistance (for the contact) and a variable resistance. rgatemod=2 computes the effective series resistance and adds a single extra node to the circuit matrix. rgatemod=3 add two extra nodes, keeps the two resistors separate, and also connects the overlap capacitances (CGSO, CGDO, and I think CGBO) to the point in the middle of the two resistors. I believe the argument is this is more accurate, but perhaps not worth the extra matrix row (which can make for a large matrix in big circuits).
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