Sigma-Delta微加速度计改进型梳状滤波器的设计  

Design of modified comb filter in Sigma-Delta micro accelerometer

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作  者:谭晓昀[1] 周贤中[1] 刘晓为[1] 

机构地区:[1]哈尔滨工业大学MEMS中心,哈尔滨150001

出  处:《哈尔滨工业大学学报》2009年第11期81-84,共4页Journal of Harbin Institute of Technology

基  金:国家高技术研究发展计划资助项目(2008AA042201)

摘  要:为了改善Sigma-Delta微加速度计中梳状滤波器的性能,提高输出信号的信噪比,通过调整梳状滤波器的零点位置,可以得到改进型的梳状滤波器.研究表明,改进型梳状滤波器在不同的零点位置,表现出不同的量化噪声过滤性能.于是,利用遗传算法可以快速的求出输出量化噪声最小时的零点位置最优值.并通过对比四阶梳状滤波器和改进型梳状滤波器的幅频特性,发现改进型梳状滤波器在折叠区域有着更快速的截止性能,因此这种改进型梳状滤波器比经典型梳状滤波器有着更好的量化噪声过滤性能.In order to improve the performance of the comb filter in Sigma - Delta micro accelerometer and promote the output SNR, the comb filter is modified through adjusting its zero location. According to the research results, the modified comb filter exhibits different quantizing noise filtering capabilities corresponding to different zero locations, and then, the genetic algorithm is employed to attain the optimum zero location which leads to the minimum output quantizing noise. By comparing the amplitude - frequency characteristic of the modified comb filter with that of a fourth - order comb filter, it is proved that the modified comb filter has a rapid cut - off characteristic, which means that the modified comb filter functions much better than the existing comb filter with the criterion of quantizing noise filtering capability.

关 键 词:SIGMA-DELTA 微加速度计 梳状滤波器 

分 类 号:TP212[自动化与计算机技术—检测技术与自动化装置]

 

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