If I use LTspice do I have to modify the SPICE models that I download from MOSIS? 

The models I download from CMOSedu.com work great with LTspice but I want to try 

some other technologies.


Yes, but you will have to change the Level = 49 to Level = 8 for the BSIM3 models you 

download from MOSIS at: http://www.mosis.com/requests/test-data


For the BSIM4 models LTspice uses Level = 54 which is what MOSIS supplies so no 

change is needed.


In any case I would download the models, draft a ring oscillator, and compare the 

simulated oscillation frequency to the measured value reported by MOSIS in these files 

to verify that the models are working correctly.