555时基混沌电路  

Chaos circuit design based on 555 timer

作　　者：黄海勇 程杰 李文石[1] HUANG Hai-yong;CHENG Jie;LI Wen-shi(School of Electronics and Information Engineering,Soochow University)

机构地区：[1]苏州大学电子信息学院

出　　处：《中国集成电路》2022年第10期40-45,60,共7页China lntegrated Circuit

基　　金：2017年近代声学教育部重点实验室开放课题(No.1703)。

摘　　要：提出应用一颗单555芯片、一个5 kΩ电阻和二个0.01μF电容,构造与实现电路结构最简单的5 V单电源供电的混沌信号发生器。反馈电路设计的组合特点是R1C1低通单元负责电容充放电和芯片启动输出脉冲,C2RT高通单元开闸释放芯片输出端的宽带混沌信号直接馈给阈值端以便维持混沌态。分别应用了3颗芯片,采集多谐振荡器与混沌发生器的输出端和阈值反馈端的电压信号,分别基于最大李指数、谱熵复杂度、弹簧测试的结构蠕变率,计算与判别输出端和阈值端的时域信号的周期或准周期稳定性、混沌特性及其复杂性。结论是应用555时基芯片的最简扩展电路成功得到了复杂的混沌信号流,其中的混沌产生机制主要源于芯片内嵌的施密特触发器的随机共振现象。A chaotic signal generator powered by 5 V power supply with the simplest structure is constructed and realized,with one 555 chip,one 5 kΩresistor and two 0.01μF capacitors.The combination features of the feedback circuit design are that the R1C1 low-pass unit is responsible for capacitor charge and discharge and the chip start-up,while C2RT high-pass unit is fit to release and maintain the chaotic broadband signal at the output of the chip and feed directly it to the threshold end.Three chips in same type are used for collecting the voltage signals at the output port and threshold feedback end of the multi-vibrator and chaos generator,then we calculate and judge the periodic or quasi periodic stability,chaotic characteristics and complexity of gained time-domain signals with three indicators of max Lyapunov exponent,spectral entropy complexity and spring test’s construction creep rate.The conclusions catch successfully the complex chaotic signal flow based on 555 timer with the simplest feedback components,further the mechanism of chaos results from the stochastic resonance phenomenon of Schmidt trigger embedded in 555 chip.

关 键 词：555芯片 反馈滤波器 混沌信号 混沌判据 复杂性度量 

分 类 号：TP401[自动化与计算机技术]