Geoffrey_Coram
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BSIM4 has parameters to model gate to drain overlap capacitance, as well as the CF parameter to model fringing capacitance -- but you have to check your model card for the mos device to see if the foundry zeroed those out with the expectation that you'd extract values -- note that CGDO and CF have computed defaults, so if they're not in the model file, you can still get a non-zero value.
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