The Realization And Study Of Multi-scroll Chaotic Circuit Based On CCCII

Chaos is a random behavior generated by deterministic nonlinear system. It is extremely sensitive to the system’s initial conditions. As a new cross subject,because of its peculiar dynamic characteristic,it is widely applied to those fields such as mathematics,biology,communication, and also shows us its amazing application prospect in these areas.Comparing with traditional chaotic attractors, multi-scroll chaotic attractors have more complex dynamic characteristics and more key parameters, so they attracted the engineers concern and attention about the advantages of anti jamming,anti interception in communication,and raised a study upsurge of multi-scroll chaotic circuit. With the rapid development of electronic and computer technology, electronic equipment and other products showed the characteristics of high frequency and high speed. While the current conveyor as a kind of device which has good frequency gain characteristic,larger dynamic range,low power consumption and so on, began to cut a striking figure in electronic circuit design. Importantly, it can meet the requirement of the component that high speed and frequency products are required. In recent years, the advantages about using CCCII to construct the chaotic circuit are recognized bymany people.So the research of constructing superior performance multi-scroll chaotic systems based on CCCII is of significance in practice. It not only provides a new direction for the design of chaotic circuit,but also lays the foundation for the practical application of chaos in secure communication.Based on this, the following work has been done in this paper:1)Proposed a new nonlinear function circuit. This circuit is mainly composed of CCCII and some of passive components,such as R,C.And the structure of the circuit is simple and flexible.What’s more, the appropriate adjustment of circuit element parameters can realize the conversion between different nonlinear function. At the same time, we do some analysis on its principles and characteristics.The feasibility of the method is verified by Pspice software.2)The implementation of multi-scroll chaotic attractors based on CCCII.Based on classical Chua’s circuit and Jerk chaotic system, using nonlinear function extend the index of 2 saddle focus equilibrium point of chaotic system which can make the structure of the multi-scroll chaotic attractors extends to the plan, thus forming a single-scroll or multi-scroll chaotic attractors.Also,we analysis the chaotic dynamical characteristics, such as calculating the Lyapunov index,equilibrium point eigenvalues, and drawing the bifurcation diagram. Finally, the realization of multi-scroll chaotic circuit was simulated by Pspice, the result confirms that the method using CCCII to construct the circuits is feasible.3)The research of spread spectrum communication based on Jerk chaotic sequence. We take the signal generated by Jerk chaotic system as the research object, making a study on the method for the conversion of the chaotic spread spectrum sequences, and also making a detail analysis on the sequences. The results show that, the sequences generated by chaotic system can meet the requirements for reliability of communication system.