Computer Model of Radio Frequency Power Amplifier

Processes in output circuits of radiofrequency power amplifiers are considered. It is shown that traditional analytical methods of their performance analysis are complex and time-consuming. Application of computer simulation in MATLAB environment for studying performance of radiofrequency power amplifiers is proposed. A model of a tuned output circuit of the class C power amplifier is designed. This model accounts for resonance properties of the tuned circuit as well active losses in it. Verification of the model was carried out for standard situations using well-known formulas for amplitudes of harmonic components. Verification results clearly show validity of the model. For example, when it comes to harmonic components, the model has an error around half a percent. The designed model was used to study the circuit performance in two scenarios of interest and obtained results conform to the theoretical interpretations of the processes in radiofrequency amplifiers. The designed model clearly, graphically and with high precision shows the processes unfolding in the output circuits of the power amplifier. It can be used to study performance of the power amplifiers and to search for ways to improve their characteristics.