A new improved model for subthreshold slope for submicron MOSFETs
A new improved analytical model for the subthreshold slope (ss) for submicron MOSFETs, suitable for analog circuit CAD work is presented in this paper. An existing ss model (independent of drain voltage) is taken up and is modified in order to include the effect of the drain voltage. Additionally, it accounts for the effects of the effective channel length and the body voltage on the ss. An attempt is also made to represent the fudge factor, used widely in existing literature in the expression for the characteristic length, by a more physical representation than was done before. This ss model has been put in an existing drain current model in order to obtain the dc characteristics. The simulated results are compared with those reported experimentally for MOSFETs having channel lengths less than hundred nanometers, and the results show an excellent match between the two.
subthreshold slope submicron mosfets dibl parameter