基于累积释放模型的测量电路研究

Study of measurement circuit based on IFM

在谐振式传感器、多普勒频移等应用中测量频率的相对变化更有用,因此探索对频率变化的精确测量有很现实的意义。以圆映射动力学为理论基础,按照累积-释放模型的变化规律设计测量电路。在一定的条件下,使电路处于混沌状态,这时的输出对频率的变化非常敏感。在输出轨道的符号序列与输入信号的频率之间建立对应关系,频率的微小变化可以转化为符号的变化。仿真研究和电路实验都表明,该方法容易实现较高的测量精度。

In applications such as resonance sensor and Doppler frequency shift measurement,relative values are more useful.So it is practical to explore precise measurement of frequency change.Based on circle map dynamics and Integrate-and-Fire Model（ab.IFM）,a type of measurement circuit is proposed.By adjusting the value of circuit parameters and the amplitude of threshold signal,the circuit may work in chaotic state and the output is sensitive to the frequency.The corresponding relation between output symbolic sequence and frequency is established,so the weak divergence of frequency may cause changes of symbolic sequence.Simulation and circuit experiment show that there are advantages in achieving higher precision.