谐振式微传感器低功耗专用信号源研究  

Research on Low-Power Signal Source for Micromachined Resonant Sensor

作　　者：樊尚春[1] 骆东君[1] 邢维巍[1] 

机构地区：[1]北京航空航天大学仪器科学与光电工程学院,北京100191

出　　处：《传感技术学报》2011年第2期227-232,共6页Chinese Journal of Sensors and Actuators

基　　金：国家自然科学基金微机械谐振子激励检测方法及阻尼控制研究(60804062);国家自然科学基金谐振式硅微结构传感器综合测试分析仪器(60927005)

摘　　要：为满足谐振式微传感器对信号源低功耗、低失真的要求,本文提出了一种对现有DDS(直接数字合成)技术进行改进的方案,将现有的零阶保持逼近改进成为折线逼近来减小失真,并通过详细的公式推导给出了改进后波形失真度THD(总谐波失真)的计算公式。最后给出了MATLAB仿真结果和电路实现结果来验证方案可行性。结果表明在同等失真度下本方案大大减小了对系统频率的要求,为减小信号源功耗提供了理论依据。To meet demands for low power and low distortion of micromachined resonant sensor,this paper presents a method to improve present direct digital synthesizer（DDS）technology,replacing current zero order holding approximation method to polyline approximation method to reduce the distortion.A theoretical formula in time-domain was calculated,describing the relationship between the number of discrete points and the total harmonic distortion（THD）,and confirming the feasibility of this method by MATLAB simulation and circuit realization.This proposed design reduces the demand of system clock but remaining the spectral purity of signal.Moreover,it can be an important theoretical reference of achievement of low power dissipation.

关 键 词：谐振式微传感器 低功耗信号源 DDS 折线逼近 锯齿波发生器 THD 

分 类 号：TP212.1[自动化与计算机技术—检测技术与自动化装置] TN741[自动化与计算机技术—控制科学与工程]