PARAMETRICAL SYNTHESIS OF AMPLITUDE-PHASE MODULATORS WITH THE PRESET NUMBER OF IDENTICAL CASCADES OF THE «NONLINEAR PART – COMPLEX QUADRIPOLE» TYPE

Abstract

Use of the complex quadripoles, each two-pole terminal of which consists of resistive and reactive elements, allows to create wideband radio devices. Therefore, the development of algorithms for the parametric synthesis of amplitude-phase modulators using complex matching quadripoles is an actual issue. In the present work the coordination provides the set dependence of the ratio of modules and phase difference of the transfer function on frequency in two states of nonlinear element, determined by two levels of the control signal. The nonlinear part represents a three-pole nonlinear feedback element. Interrelations between elements of a classical transmission matrix of two-trminal networks are established and formulas for determining the complex resistance of their two-poles, which are optimal in terms of the criterion for providing amplitude-phase modulation of the output signal are obtained. The quadripole theory, methods of matrix algebra, parametrical synthesis of SHF control devices, decomposition and circuit analysis of radio devices are used. The comparative analysis of theoretical results (frequency response and phase response of modulators in two states), obtained using mathematical modelling in the «MathCad», system and experimental results obtained by circuit simulation in «OrCad» and «MicroCap» systems, confirms their satisfactory coincidence.