交流耦合蔡氏电路的计算机仿真研究

Computer Simulation on AC coupled Chua's Circuit

该文用计算机仿真的方法分析了采用电容交流耦合的非线性负阻对蔡氏电路混沌特性的影响,其结果验证了当耦合电容相对振荡频率足够大时,该电容的加入对蔡氏电路的混沌特性影响不大。采用交流耦合后,利用高频电路实现的各类等效负阻器件得以在蔡氏电路中应用,因而可以获得工作在更高频段的混沌振荡。作为应用实例,该文给出了一个采用标准偏置隧道二极管实现的、混沌带宽达到数百兆赫兹的混沌电路。该电路可以用于宽带载波通信电路中。

In this paper, a capacitance AC - coupled Chua＇s circuit is presented and analyzed using computer simulation. The results verify that the additional capacitance affects little to the original Chua＇s circuit when it has a comparatively large capacitance volume with respect to the effective oscillation frequency. After doing this, various high - speed negative resistance devices and/or circuits can be used to replace the op amp based narrow band Chua＇s diode and therefore, higher chaotic oscillation can be obtained. As an application example, a tunnel diode based Chua＇s circuit with standard DC bias is given, whose spectrum of chaotic signal has reached hundreds of megahertz. This circuit can be used in the communication circuit based on wide- bandwidth carrier.