Geoffrey_Coram
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Since the bulk-source diode is there in any physical mosfet you can manufacture, but it is missing from the spice simulation, then yes, I'd say the spice model has a problem.
It could be that the diode is modeled externally as part of a subckt (the bsim3v3 diode model isn't very sophisticated); you'd have to check that -- and I'd still expect it to turn on and prevent the mos from seeing a forward bias on its b-s junction.
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