Simulation of a cubic-like Chua's oscillator with variable characteristic

An alternative version of Chua’s oscillator is obtained using a cubic-like nonlinearity [2], which is implemented with two CMOSFET transistors. We propose a modification of this implementation that allows to change the shape of the characteristic in an easy way. A mathematical model of the circuit is derived based on the equations of MOSFET transistors [3] and a Chua’s circuit is simulated using this model. Chua’s circuit presents several strange attractors that are obtained in the simulation for different values of the bifurcation parameter. We have studied the dependence of these phenomena on the shape of the characteristic of Chua’s circuit.