Multipole Circuit Research Articles

Development of methodology for determining a-parameters of an asymmetric rail line

The article considers the methodology of forming the matrix of A-parameters of a rail line, represented by a multi-pole equivalent circuit. It is shown that when using a four-pole equivalent circuit of a rail line in case of violation of the equipotentiality of the circuit, it is impossible to take into account the flow of current along bypass paths, along the earth path, and the influence of adjacent track circuits. A multi-pole equivalent circuit of a rail line is represented as a 2x4 pole, in the rail lines of which self-induction EMF sources are included, and an earth path is used as the second wire. An equivalent multi-pole of equivalent circuit is represented by two groups of poles – at the input and output of the rail line, including one common (ground). The parameters of all elements of the equivalent multi-pole circuit are presented in the form of matrices, which makes it possible to analyze the state of the rail lines when changing the primary parameters of the rail multi-pole in a wide range. Using Kirchhoff's laws and solving a system of ordinary differential equations, the A-parameters of a rail multi-pole are obtained.

Load Modes Variation in the Circuit Test Diagnosis

The power sources (current sources and e.m.f.) commonly used as a testing influence on circuit in realization test diagnosis. A new way of the testing experiments organization with analog circuit is considered. It is mean the different test modes of the target circuit arise as a result of variations in wiring diagrams or numerical parameters of the connected passive elements. The problem of the circuit diagnosing with variation of load of the active multipole circuit with partly inaccessible nodes is analysed. Examples are given.

Multipole measuring transducers of microwave circuit analyzers

Multipole circuit analyzers permit the determination of terminal and transfer apparatus parameters with high accuracy and in a broad frequency range by using just amplitude value displays [1-4]. When creating such circuit analyzers the developers have the problem of selecting those of the class of possible multipole apparatus that can perform the function of measuring transducers [i, 2]. This depends on the values and relationships of the intrinsic network parameters. Consequently, it is expedient to generate requirements on the parameters and to set up selection criteria for the multipole measuring transducers. Presented in Fig. 1 is a generalized multipole measuring transducer circuit 2 to whose input a signal from the generator 1 comes. The load 3 under investigation and the power displays 4...n fixing the values of the powers P#"'Pn which are related to the complex amplitudes of the incident b and reflected a waves in the plane of the load connected by the equations [2] pi=lAia+BtblZ ' (1) are connected to the transducer outputs, where A i, B i are the intrinsic parameters of the multipole measuring transducer (MT).