Simulation of Chua’s chaotic oscillator using unity-gain cells

A novel topology to design a chaotic oscillator which is based on Chua’s circuit, is proposed. The chaotic oscillator is realized with unity-gain cells, that is, the use of Voltage Followers (VF) and Current Followers (CF) to emulate the behavior of the two most important elements of the Chua’s circuit: the active three-segment voltage controlled nonlinear resistor and the grounded inductor. Furthermore, it is shown that a Negative Current Follower (CF-) can be implemented by using the IC AD844AN type Current Feedback Operational Amplifier (CFOA). The approach shows that the proposed topology can generate chaotic oscillations, where the HSPICE simulations have been obtained by using the macromodel of the IC AD844AN in conf iguration of unity-gain cell. Therefore, chaotic behavior in the time domain and the state space are presented.