PARAMETRICAL SYNTHESIS OF PEAK-PHASE MODULATORS WITH THE SET QUANTITY OF IDENTICAL CASCADES OF TYPE «THE NONLINEAR PART – THE RESISTIVE TWO-PORT NETWORK»

Abstract

Resistive elements possess independence of their resistance from frequency in a very wide band of frequencies. Therefore, developing algorithms of parametrical synthesis of amplitude-phase modulators with the use of resistive matching four-pole networks is an actual task. In this work, matching provides the set dependence of a relation of modules and a difference of transfer function phases from frequency in two conditions of a nonlinear element defined by two levels of a control signal. The nonlinear part represents a three-pole nonlinear element with a feedback. The interrelations between elements of the classical matrix of transferring in four-pole networks are established, and the formulas for defining resistances of their two-pole units that are optimum by the criterion of amplitude-phase modulation of an outputt signal are determined. The theory of four-pole networks, as well as the methods of matrix algebra, parametrical synthesis of UHF control devices, decomposition and circuit analysis of radio devices are used. The comparative analysis of theoretical results (AFC and PFC of modulators in two states) received by mathematical modelling in the «MathCad» system and of experimental results received by circuit simulation in the «OrCad» and «MicroCap» systems shows their satisfactory coincidence.