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A CMOS Readout Circuit for SOI Resonant Accelerometer With 4- /22/103Bias Stability and 20-/22/103/61 /72/122Resolution Lin He, Student Member , IEEE, Yong
提出了一种用于SOI谐振加速度计的CMOS读出电路,采用全差分拓扑结构,提高了信噪比。
3.3V供电,140Hz/g比例因子,20Hz分辨率,4bias稳定性
加速度计偏置稳定性MEMS谐振器振荡器相位噪声
▸创新点1:全差分CMOS读出电路 - 采用全差分电路拓扑结构,显著提升信噪比(SNR),在3.3V电源电压下实现高性能信号处理,适用于SOI谐振加速度计。
▸创新点2:二阶AAC环路滤波器 - 通过引入二阶滤波技术,有效抑制噪声(尤其是1/f噪声),并减少振幅硬化效应引起的相位噪声,提升系统稳定性。
▸创新点3:新型斩波稳定整流器 - 采用创新的斩波技术,进一步降低噪声干扰,优化AAC环路性能,确保信号的高精度检测与处理。
▸创新点4:时间域驱动与传感分离 - 通过时间域分离驱动和传感操作,避免强驱动串扰,同时复用相同电极,简化系统设计并提高可靠性。
Abstract
dent Member , IEEE, Yong Ping Xu , Senior Member , IEEE, and Moorthi Palaniapan
Abstract—A fully differential CMOS readout circuit for SOI res-
onant accelerometer is reported. The readout circuit is essentially
an oscillator , consisting of an oscillator and a low noise automatic
amplitude control (AAC) loop. A differential sense resonator is
proposed to facilitate fully differential circuit topology and im-
proves the SNR under a 3.3-V supply. A second-order AAC loop
filter and a novel chopper