Inductive impedance converters based on a combined feedback operating circuit

Abstract

An operating scheme with combined feedback is characterized by a functionally com-plete set of input impedances, the values of which are determined by the amplitude and phase relationships between the voltages of the excitation sources, as well as the impedances in the positive and negative feedback circuits. Such an operating scheme is a generalized model of impedance converters, on the basis of which it is possible to significantly simplify the synthesis of converters and inverters of positive and negative impedances, taking into account the peculiarities of their inclusion in the electrical circuit.
For the synthesis of a converter of a grounded inductive impedance into a positive grounded inductance, a variant of the generalized model with one grounded excitation source in the form of a negative impedance converter is chosen. By serial double conversion of the initial inductive impedance at the output of the second converter, an inductive impedance is obtained, which is a grounded inductance with an active resistance, the values of which depend on the feedback resistance of the converters. The latter makes it possible to independently control the values of the components of the synthesized inductive impedance.
The synthesis of the converter of ungrounded inductive impedance into positive grounded inductance is realized on the basis of a generalized model with two in-phase excitation sources. In the converter, the effect of separate multiplication of the inductive and active components of the initial impedance is achieved, and with the possibility of obtaining an active resistance of a given value with both positive and negative signs. The latter makes it possible to build a harmonic generator on the basis of the synthesized inductance, as well as to realize the inductance of a given value with a high quality factor.