摘要
提出了一种应用于宽带混沌信号发生器的Cascode结构微波混沌振荡器。利用微波晶体管BFG520对混沌振荡电路进行了设计和验证,通过在振荡电路与输出端口之间增加射极跟随器实现输出隔离并降低负载牵引的影响。基于晶体管Gummel-Poon模型对电路进行了PSpice仿真,结果证明新结构在很宽的参数变化范围内具有混沌特性。数值计算和实验测试结果表明:相比经典Colpitts混沌振荡器,新结构的李亚谱诺夫指数的维度提升了20%,达到2.5;测试频谱的基本频率提升了33%,达到1.41GHz。
A microwave chaotic Cascode-oscillator which can be used as wideband chaotic signal generator is presented.The chaotic oscillation circuit is designed using microwave transistor BFG520.A source follower is added between the oscillation circuit and output port for isolation and to reduce the load influence.The PSpice simulation results based on Gummel-Poon model of BFG520 proves that the novel circuit has a chaotic performance in a large range of parametric variation.Numerical and experimental results show that：compared to traditional chaotic oscillator,the Lyapunov dimension of the novel circuit is improved 20% and up to 2.5,the fundamental frequency of the measured spectra is improved 33% and up to 1.41 GHz.
出处
《国外电子测量技术》
2016年第8期86-89,共4页
Foreign Electronic Measurement Technology
基金
国家自然科学基金(61374136)
上海市自然科学基金(12ZR1411800)项目资助
