Hi Thomas, This is because the model you were using is a three terminal subckt, and the nmos4 (the 4 is the clue) is a 4 terminal transistor. To fix this you could take your nmos4 and remove the bulk pin from the symbol (and the spectre view) and then in the CDF (Tools->CDF->Edit, pick "Base" as the CDF Level and then go to Simulation Information and find the spectre simulation information, and remove the B references in the termOrder and termMapping). The 3-terminal transistor nmos doesn't help much because the stopping view (spectre view) has a terminal for B which finds the fourth terminal via a property - so you'd have to do pretty much the same edits to that too. Regards, Andrew
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