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Two Port Hybrid Models for Spice Simulation

Krishnapuram Kumar

Abstract


From the definitions of two ports Z, Y and S parameters, two port linear models are represented by hybrid equations at the input and the output. These representations have been used by Spice, Pspice computer analysis programs to give circuit two ports for simulation and analysis of electronic circuits. The analog behavioural option is effectively used in modelling the two port linear circuits. The current generator VALUE option is used to model DC networks with pure resistances and controlled sources. The LAPLACE option is used to conveniently describe the two ports with parameter values given in rectangular or cartesian form. The FREQ option of analog behavioural modelling is used effectively to model rectangular complex impedances and admittances and voltage and current gains of two ports. An example of common emitter bipolar amplifier (with DC or low frequency) is given and is simulated with the commercially available BJT with parasitic resistances. An example of simulating voltage series amplifier driven by 50 Ohm load and 50 Ohm source impedances using hybrid representation is given. Another circuit of voltage shunt feedback amplifier is modelled and simulated. The method and procedure described here would be useful if any four of the two port parameters are known and not necessarily of the same kind. A combination of Laplacian analog behavioural model with FREQ type to represent a two port circuit is given with results. Two circuit files for the simulation of voltage shunt and current series feedback circuits are given. The procedure described in this work can be extended to model N port Z, Y circuits easily.

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References


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