The development of communication systems and devices requires full automation of their design process to quickly update the RED. Especially important is the development of software for the synthesis of basic electrical circuits. The article describes the algorithm of end-to-end CAD based on an expert system for the synthesis of basic electrical circuits of RED based on an object-oriented hybrid expert system. Algorithms for forming the knowledge base at the learning stage and output in the synthesis process are considered. The algorithmic and software hybrid production ES and knowledge base are described. The system organization of structured information about the synthesis of blocks and the entire RED. It allows you to effectively form and manipulate the knowledge of RED design experts. The method for introducing and using a set of constant and variable confidence coefficients in the ES has been developed, which allows using unformalized knowledge about the field of RTU design. This ensures the application of both the knowledge obtained during the training of the ES and the knowledge accumulated during the design of the RED of the ES itself. All this allows the designer to formalize knowledge faster and more accurately, as well as increase the speed of automatic design since unlikely circuit solutions are not considered.
Today, different modeling methods are used for computer analysis of circuits of radio engineering devices (RED) in the time and frequency domains. The article provides a comparison and highlights the features of using the methods of nodal potentials and variable states. Developed methods of optimization of electrical circuits and discusses the possibility of calculating the margin of stability when changing the parameters of the circuit elements and the search of critical parameter values; theoretically and experimentally confirmed the advantages of using MEAs in the analysis of RED; proposed and implemented ways to eliminate the major disadvantages of the IPU; expanded and improved methods for obtaining the mathematical model of the circuit; the mathematical method allows to obtain the characteristic polynomial of a circuit without calculating its transfer function; the developed block for processing parameters of electrical circuit elements using scaling coefficients can significantly improve the accuracy of calculations; the use of speed-optimized algorithms makes it possible to analyze fairly complex circuits on a medium-performance PC. Developed software allows to analyze a wide class of linear, linearized, and nonlinear circuits for the RED, containing the active elements. The analysis of real electrical circuits proves the validity of all the proposed methods.
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