Research And Implementation Of Multi-scroll Chaotic Circuit Based On Current Conveyers

Multi-scroll attractors application in the communication system can better hideto transmit signal and has better secrecy because of its preferred more dynamicalcomplexity over the double-scroll attractors. In recent years, much attention havebeen given to achieve chaos circuits based on the current conveyor due to thecurrent conveyor has good frequency gain characteristic.This paper briefly introduces the research background and significance ofchaos, and analyzes the domestic and international research status of multi-scrolltype chaotic circuit. Meanwhile, the advantages and disadvantages of variouschaotic circuit structures are summarized. The main innovative work consist of thefollowing aspects:1) An approach of generating grid multi-scroll chaotic attractors with thepositive-type second generation current conveyors (CCII+) is presented. Firstly, athree dimensional grid multi-scroll chaotic system is presented. Some basicdynamical properties are studied. Furthermore, we construct the saturated functionswith current output and design the chaotic system with series feedback structure byusing current conveys. All design has taken the port parasitic parameters of currentconveys into considerations. By analyzing we could learn that the circuit can workin higher frequency. Finally, the effectiveness of this method has been verified bycircuit implementation.2) A grid multi-scroll chaotic circuit realized on CMOS second generationcurrent conveyors is presented. The proposed grid multi-scroll chaotic circuit isbased on second generation current conveyors that constructed by TSMC0.18μmCMOS technology as basic active module, and introduced a passive RC integratorand building the current step function sequence based on second generation currentconveyors. The chaotic circuit is mathematically modeled, which is a new set ofthree-order autonomous nonlinear ordinary differential equations. The dynamicalbehaviors of chaotic system are further analyzed. Simulation results show that theproposed grid multi-scroll chaotic circuit working frequency were enhancedcompared with the existing literature from a±2V power supply.