this paper deals with the basic formulas for the analysis of linear circuits through subcircuits for the case where a circle can be represented by a series connection of a subset of a pair of nodes ...(one of which is grounding). The following are computer-generated long line modeling experiments performed in the system UDF MAOPCs (user-defined functions for multivariate analysis and optimization of parametric circuits) by sequentially combining its elementary units. Comparison of line modeling time with standard MATLAB tools (det () function) and authors' created function that implements the subcircuits method. The results of the comparison showed the high efficiency of the computational method both in terms of computer time and in the amount of memory required for calculations. Based on the frequency symbolic method, the system UDF MAOPCs is used in the optimal design of electronic devices of noise-immune covert radio systems using code signals.
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