The technology of modeling a field-effect transistor in the CAD system COMSOL Multiphysics is considered. The possibilities of CAD, its methods of graphical construction of the model and methods of modeling the behavior of the model are being studied. The object of study is the MOS transistor, its scope, operation and a mathematical model that can be used in designing its operation. The Shikhman-Hodges model, input and output parameters are determined, the degree of its adequacy to a real transistor is set, the main parameters are determined, with the help of which it is possible to conduct a study of a field-effect transistor, its current-voltage characteristic. A transistor model is built in the mode of operation in the mode of small-signal amplifiers, replacing it with a linear four-port model, it is described when this model can be applied when simulating the operation of the device.

The article discusses the simulation of the operation of a diode based on the compiled electrical circuit, and also considers the analysis of the operation of the dido under various operating conditions using the AnyDynamics 8 computer simulation program. Various approaches to the concept of modeling, model, and mathematical model are considered. The classification of models of semiconductor devices, current-voltage characteristic (CVC) and device operation scheme are evaluated. The physical properties of the diode are considered, then a transition is made to the analysis of the operation of the diode in a physical model, and on its basis a mathematical model of the diode is built, since the model works with small changes in current and voltage, then the transition is made to a low-signal model and a system of differential equations, behavior of an ideal diode. Classes of elementary elements are being developed, from which it is possible to build an electronic circuit, diode, resistor, capacitor, coil. A circuit is determined with the help of which it is possible to simulate the operation of a circuit with a connected ideal diode. The result of the work of the electrical circuit in the program AnyDynamics 8 was the creation o behavior of an ideal diode. Analysis of the obtained graphs in the future will allow you to perform modeling and analysis of the operation of an ideal diode.

No abstract