Geoffrey_Coram
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Vdsat does not depend on Ids; in every MOS model I've seen, the voltages are used to compute intermediate quantities (like Vdsat) and these are then used to calculate Ids, so it's the wrong perspective to think that Vdsat depends on Ids.
When you say that the operating region reported didn't match your expectation based on Vgs,Vgs,Vth, etc., how far off was it? If it's in the microvolts, then it's not worth tracking down.
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