By: K. Bharath Kumar
Formerly Researcher in Oki Electric Company, R&D Division,
Semiconductor and High-speed Devices, Tokyo, Japan
Two networks with resistors and independent sources are considered to compute Thevenin resistance. A different network is considered where the Thevenin resistance from the previous independent networks is to be incorporated (in a polynomial representation). Different methods using Spice/Pspice software to obtain the above representation are described. SPICE/OrCAD software is used to obtain equivalent circuits for Thevenin equivalent network parameters used in polynomial form are described and other different networks with these models at DC are used in simulation. Here, the individual parameters from a different Thevenin/Norton equivalent are implemented. New techniques to obtain Thevenin and Norton impedances are described with examples. Dependent voltage sources are used to describe independent energy sources, facilitating their application. Spice program to obtain impedances with a single sub-circuit description, eliminating to make zeros (current and voltages) in the circuit under consideration for Thevenin/Norton Impedance determination. Every independent voltage/current source need not be short/open circuited. Both cases (i) DC sources and pure resistors (ii) AC sources, with passive elements, are considered. The transfer function (TF command) is used for the above circuits, and the results are verified. A Thevenin equivalent circuit can be used in place of a circuit with resistors and separate sources of voltage and current. Both circuit analysis and simulation can benefit from this substitution.
Keywords: Analog passive network theory, non- linear circuits, complex variables, circuit analysis and modelling, solid state circuits, microwave circuits, VLSI technology
Citation:
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