Geoffrey_Coram
|
SA/SA1 are instance parameters, meaning that the instance should have values that indicate how that particular device is laid out; AD, AS, PD, PS are also instance parameters. The model file describes common parameters. If ultrasim is using the wrong values for the stress parameters, then it will incorrectly compute the shift in threshold voltage due to stress.
If it's a small test netlist, you could delete all the sa/sb/sc parameters and see if you get the same threshold voltage. Then we can work on seeing if we can fix the parameter names. Eg, "sa1" is not an official BSIM parameter, it is part of a foundry-specific STI stress model; there are values SA1 through SA9 for up to 9 gate segments. It may be that ultrasim doesn't support these unofficial parameters.
|