Digital simulation of nonlinear circuits by wave digital filter principles

The known principles of wave digital filters are used to simulate certain nonlinear circuits by digital means. Nonlinear elements-in particular, resistances having a continuous piecewise-linear voltage-current characteristic-are considered. It turns out that a representation of a nonlinear resistance in terms of the wave variables may exist, even if the voltage-current characteristic is neither voltage-controlled nor current-controlled. As an example, Chua´s circuit is considered. It is shown that in the wave digital model of this circuit, essentially the same double-scroll attractor can be observed as in the corresponding analog realization.