新型两级超宽带混沌电路的设计与实现

Design and Implementation of a Novel Two-Level Ultra-Wideband Chaotic Circuit

为了满足超宽带混沌通信系统对混沌信号源的要求,提出了一种新型两级超宽带混沌电路的设计,有效地提升了混沌信号的带宽.与经典的考毕兹混沌电路的结构相比,新型结构采用带有集电极电感的射极输出器作为信号输出端,引入高频谐振网络,补偿高频处信号功率谱密度,拓展频带宽度.通过MATLAB软件求解新型两级超宽带混沌电路的数值解,得到新型超宽带混沌电路的分叉图、相图;仿真分析得到电路输出的时域图、频谱图.结果表明:新型两级超宽带混沌电路可产生功率差在20 dB内、带宽约为7.5 GHz的宽带混沌信号,满足超宽带信号指标(3.1~10.6 GHz)对混沌信号源的要求.

In order to meet the requirements of chaotic signal sources for ultra-wideband chaotic communication systems,a new two-stage ultra-wideband chaotic circuit design is proposed to improve the bandwidth of chaotic signals effectively.Compared with the classic Colpitts chaotic circuit structure,the new structure uses an emitter follower with a collector inductor as the signal output end and introduced highfrequency resonance network.Thereafter,the signal power spectral density is compensated at high frequencies and the bandwidth was extended.The numerical solution of the new two-stage ultra-wideband chaotic circuit is obtained by MATLAB,and the bifurcation diagram and phase diagram of the new ultrawideband chaotic circuit are obtained.The time domain diagram,spectrum diagram of the circuit output are also obtained through simulation analysis.It is shown that the new two-stage ultra-wideband chaotic circuit can generate 7.5 GHz wideband chaotic signal with a power within 20 dB,which meets the requirements of ultra-wideband signal indicators(3.1~10.6 GHz)for chaotic signal sources.