Algorithm of class FRF amplifying stage design

This article describes an algorithm for the automated design of a powerful RF class F amplifier. The proposed approach develops the amplifier as an active two-port network by first designing, testing and optimizing the circuit topology and component parameter values of a selected existing operational circuit. The main goal is to achieve the desired output efficiency with a relatively small number of iterative actions. A synthesized description of a program-automated methodology for the practical application of the S-matrix method for researching the amplifier as an active quadrupole through the development and research of a specific high-efficiency radio frequency amplifier based on set output parameters has been made. For this purpose, an automated calculation module was created in the Keysight Genesys programming environment, which enables the parameters of one or several elements of the circuit to be directly changed simultaneously or separately by means of graphic interactive positioning of the operating point corresponding to the desired maximally effective operating mode of the amplifier for the design frequency range. With its help, a single-stage circuit of a radio frequency amplifier operating in key mode class F, with an output power of 200W at an operating frequency of 3.50 MHz, was designed and investigated. The developed automated simulation module contributes to the characteristics and overall behaviour of physically realized RF amplifiers used in telecommunication devices to be closer to the preliminary simulations, i.e. the unforeseen negative effects become less and less, which significantly lowers the cost of the final products.