光学精密工程2009，Vol.17Issue(6)：1228-1232,5.
微加速度计中Sigma Delta调制与脉冲编码调制的对比分析
Comparative analysis of Sigma Delta modulation and pulse code modulation in micro-accelerometer
摘要
Abstract
A comparative study of the Sigma Delta Modulation(SDM) and the Pulse Code Modulation(PCM) is presented, and the advantages and the disadvantages of the two kinds of modulation are also obtained. A 2-bit SDM simulated system and a 2-bit (PCM) simulated system for a micro-accelerometer are established in this paper. Then, the accelaration signals pass through the modulations are comparatively analyzed, and the difference of two mudulations output waves is obtained by the comparive analysis. Finally, the power spectral density patterns of two kinds of the modulated signals are computed with a periodogram respectively. The power spectral density from experimental results indicates that the quantization noise of the PCM is more serious than that of the SDM in the low frequency, but the quantization noises of both modulation methods are the same in the high frequency. The simulated results show that the SNR of the SDM is 20 dB higher than that of the PCM, though the SDM modulation system is more complex than the PCM.关键词
Sigma Delta调制/脉冲编码调制/微加速度计Key words
Sigma Delta modulation/pulse code modulation/micro-accelerometer分类
机械制造引用本文复制引用
谭晓昀,周贤中,姜一鸣,陈伟平..微加速度计中Sigma Delta调制与脉冲编码调制的对比分析[J].光学精密工程,2009,17(6):1228-1232,5.基金项目
Supported by the National High-Tech Research and Development Program of China(863 Program)(Grant No.2008AA042201) （863 Program）
