I. Introduction
Many methods of automatic synthesis of electronic circuits were published. Some of them implement modem optimization methods such as genetic algorithms or genetic programming [1], [2], [3]. Transformation from desired transfer function to active - RC circuit structure using mathematical modifications of admittance matrix was presented in [4]. The goal of these methods is to develop a tool for automatic synthesis of electronic circuits where engineer without deeper knowledge of principles of electronic circuits should be able to design analog structure which realizes desired transfer function. Another area of using these methods is searching for new circuit structures based on new active blocks.