混沌背景下信息处理的A／D转换器原理与实现研究

A theory and practice of chaotic A/D converter

以混沌系统的初值敏感性为基础,从倒锯齿映射出发,按照符号动力学原理,建立符号序列空间,通过计算两条轨道空间距离来进行A/D转换;用恒流式混沌电路设计了该A/D转换器,其中的敏感元件采用模拟电容以利于器件集成化;通过分析电路的优点和存在的问题,指出这种理论和方法还有待完善。实验结果表明,这种构思具有电路简单、分辨率和灵敏度均较高、非线性误差较小和适应能力较强的特点。

Based on the sensibility of the initial value of chaotic system, the proposed method begins from down saw-tooth map and builds the according to signal dynamics theory. Then the A/D converter, which is designed by constant circuit and the sensitive element is adopted by stimulant capacitance, is dealt with by computing the space distance of two trakcs, it is available to he integrated. The paper also analyzes the merits and disadvantages of circuit and demonstrates, it is necessary to improve this theory and method. The experimental results show our methods present some advantages, such as, simpleness, high sensitivity and distinguishability, less nonlinear errors and strong adapt, and so on.