改进型Colpitts宽带混沌电路设计  

Design of Improved Colpitts Broadband Chaotic Circuit

作　　者：麻晓朋 张朝霞 杨玲珍 王娟芬 MA Xiao-peng;ZHANG Zhao-xia;YANG Ling-zhen;WANG Juan-fen(Lab of Advanced Transducers and Intelligent Control System,Ministry of Education,Taiyuan University of Technology,Taiyuan Shnaxi 030024,China;College of Physics and Optoelectronics,Taiyuan University of Technology,Taiyuan Shanxi,030024,China)

机构地区：[1]太原理工大学新型传感器与智能控制教育部重点实验室,山西太原030024 [2]太原理工大学物理与光电工程学院,山西太原030024

出　　处：《计算机仿真》2019年第1期336-341,共6页Computer Simulation

基　　金：国家自然科学基金面上项目(61377089;61575137);山西省面上自然基金项目(201701D121009);山西省回国留学人员科研资助项目(2017-031)

摘　　要：由于标准Colpitts电路在高频时受寄生电容的影响,限制其基本频率的提高。针对上述问题,提出将标准二级型Colpitts电路进行改进以提高电路的基本频率,即将标准二级型Colpitts电路的电感转移到第二级三极管的基极上,在两个三极管的基极均串联一个电阻,得到二级改进型Colpitts电路。利用数值分析求解二级改进型Colpitts电路的六阶微分方程的图形与数值解,得到该电路的系统分岔图、相图、时域信号等基本信息。分析以上基本信息得知,上述电路可以有效减小寄生电容对电路谐振频率的影响,使谐振网络的总电容大大减小,提高电路所产生混沌信号的基频频率。结果表明:二级改进型Colpitts电路可以工作在周期态与混沌态,基频相比标准二级型Colpitts电路有了极大地提高。Since standard Colpitts circuit is influenced by parasitic capacitance at high frequencies,which limits the increase of the fundamental frequency. For the above problems,the inductance of two-stage Colpitts circuit was transfered to the base of the second transistor,and both bases of the two transistors connected a resistor in series,to get the improved two-stage Colpitts circuit. The numerical analysis was used to solve the six-order differential equation of the improved two-stage Colpitts circuit. The basic information of the circuit such as bifurcation diagram,phase diagram and time-domain signal was obtained. Analysis of the basic information shows that this circuit can effectively reduce the influence of parasitic capacitance on the resonant frequency of the circuit,greatly reduce the total capacitance of the resonant network,and increase the fundamental frequency of the chaotic signal generated by the circuit.The results show that the improved two-stage Colpitts circuit can work in periodic and chaotic states,and the fundamental frequency has been greatly improved compared with the standard two-stage Colpitts circuit.

关 键 词：二级考毕兹电路 基本频率 混沌态 动态特性 

分 类 号：TP391.9[自动化与计算机技术—计算机应用技术]