Journal Papers with Abstracts

1. A. R. Djordjevic, B. D. Reljin, D. V. Tosic, and T. K. Sarkar, "Transmission-line theory approach to solution of state equations for linear lumped circuits," IEEE Trans. Microwave Theory Tech., vol. 44, no. 3, pp. 479-482, March 1996.
   Abstract Linear lumped circuits containing capacitors and/or inductors are described by differential equations. In computer-aided circuit analysis, these equations are discretized in time, thus being reduced to approximate formulas involving samples of voltages and currents. It is shown that these relations can be interpreted as exact equations for networks containing transmission lines. Hence, some features of the approximate formulas gain a clear physical interpretation. In particular, convergence and energy balance properties of the formulas become obvious, confirming advantages of the trapezoidal rule over all other formulas.

2. D. V. Tosic, M. F. Hribsek, and B. D. Reljin, "Generation and design of new continuous-time second order gain equalizers using program SALEC," International Journal of Electronics and Communications (AEU - Archiv fur Elektronik und Ubertragungstechnik), vol. 50, no. 3, pp. 226-229, May 1996.
   Abstract Generation and design of new continuous-time second order gain equalizers with complex poles using the computer program SALEC (the program for symbolic analysis of linear time-invariant electric circuits) are presented. Starting from the desired magnitude characteristics, the algorithm for the second order transfer function parameters (pole/zero frequency, and pole/zero quality factors) are derived. The six new structures which can realize the desired transfer function are presented. Each structure consists of a single operational amplifier (OA) and RC oneports. The determination of the RC elements values of each structure as a function of a transfer function parameters is shown. By an example, the effect of the non-ideal characteristics of a real OA is examined and the comparison of its performance with the performance of the well known equalizers with the same transfer function is made. Programmability of pole-zero frequency/quality factors is considered. The realization of the structure in different technologies is also discussed.

3. S. M. Perovich and D. V. Tosic, "Transcendental method in nonlinear circuit theory," Electronics Letters, vol. 32, no. 16, pp. 1433-1434, Aug. 1996.
   Abstract The problem of finding the analytical closed-form solution to the current in the RC diode nonlinear circuit is studied in some detail. The well-known differential equation for this circuit is reduced to the nondimensional transcendental equation of the form Y+A=B*Y^b, 0 < Y < 1.

4. D. V. Tosic, B. D. Kovacevic, and B. D. Reljin, "Symbolic Analysis of Linear Dynamic Systems," Control and Computers, vol. 24, no. 2, pp. 54-59, 1996.
   Abstract A new approach to analysis of linear stationary time-continuous dynamic systems is proposed. The system response and its transfer functions are determined by computer-aided automated symbolic analysis in terms of the Laplace operator s and the system parameters given by symbols or symbolic expressions. A tool for symbolic analysis, the program SALTIS, is presented. The advantages of the new approach over the classical "manual" response derivation and numerical response simulation is discussed. A real-life example is demonstrated to illustrate the concept exposed. The applications of the new approach are targeted at analysis, design and education concerning linear dynamic systems.

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5. I. A. Skokljev and D. V. Tosic, "A new symbolic analysis approach to the DC load flow method," Electric Power System Research Journal, vol. 42, no. 2, pp. 127-138, 1997.
   Abstract A new symbolic analysis approach is proposed to the DC load flow method. The power system network parameters are given by symbols and the system active line power flows are derived analytically as closed-form symbolic expressions. An original program SALF is presented as a universal tool to find the line powers by an automated computer-aided algorithm. The theory of the DC load flow method is reviewed. The approach is illustrated by standard network examples. The approach exposed is targeted at researchers and experts dealing with analysis, planning and operation of transmission power system networks.

6. D. V. Tosic, A. R. Djordjevic, B. D. Reljin, "Symbolic Analysis of Microwave Circuits," Journal of Applied Electromagnetism, vol. 1, no. 1, pp. 37-45, 1997.
   Abstract Computer-aided symbolic analysis is proposed to derive closed-form, analytic expressions for transfer functions and characteristics of linear time-invariant microwave circuits. All or some of the circuit parameters are specified by symbols, and the circuit response is derived as a set of symbolic expressions in terms of these symbols and the frequency. The original program SASP to carry out symbolic analysis is presented. The underlining concept is illustrated by examples.

Last updated 1998/11/13 10:50.