ABSTRACT
This chapter presents a tutorial on the modeling of the nonlinear behavior of transistors. Improvements will be made in nonlinear model extraction software. The extraction parameters will be much less dependent upon the expertise of the tester. It is interesting to note that all transistors are fundamentally nonlinear. A major advantage of analytical models is that all the microwave nonlinear simulators provide some sort of user-defined model interface for analytical model insertion. The producers of commercial harmonic balance (HB) software recognized the need of users to customize their transistor models. However, the ease of installation of models into HB software has produced a rash of new models for many transistor types. The physics-based model would be constructed with all known parameters and simulations of current control for direct current and transient or radio frequency operation, and then compared with measured data.
