A Low-Noise Readout Circuit for Gyroscopes  

作　　者：Guanshi Wang Xiaowei Liu Changchun Dong 

机构地区：[1]Micro-Electromechanical System Center,Harbin Institute of Technology

出　　处：《Journal of Harbin Institute of Technology(New Series)》2015年第5期42-45,共4页哈尔滨工业大学学报（英文版）

摘　　要：In order to suppress the noise of gyroscopes,the method based on lock-in amplifier and capacitor matching of the low-noise readout circuit is proposed. Firstly,the principle to suppress the noise by lock-in amplifier is analyzed,and the noise model of front end is proposed. Secondly,the noise optimization for the charge amplifier is presented according to the noise model of front end. Finally,a readout circuit is constructed by this approach. The measurement results show that the parasitic capacitance of front end is 18 p F,and the noise at resonant frequency( 4 k Hz) is 133 n V / Hz1 / 2,and the overall bias stability is 30° /h,and the noise level is 0. 003° /( s·Hz1 / 2). The noise of the gyroscope with the low-noise readout by this method is suppressed effectively.In order to suppress the noise of gyroscopes,the method based on lock-in amplifier and capacitor matching of the low-noise readout circuit is proposed. Firstly,the principle to suppress the noise by lock-in amplifier is analyzed,and the noise model of front end is proposed. Secondly,the noise optimization for the charge amplifier is presented according to the noise model of front end. Finally,a readout circuit is constructed by this approach. The measurement results show that the parasitic capacitance of front end is 18 p F,and the noise at resonant frequency（ 4 k Hz） is 133 n V / Hz1 / 2,and the overall bias stability is 30° /h,and the noise level is 0. 003° /（ s·Hz1 / 2）. The noise of the gyroscope with the low-noise readout by this method is suppressed effectively.

关 键 词：LOW-NOISE noise optimization charge amplifier GYROSCOPE READOUT 

分 类 号：TN492[电子电信—微电子学与固体电子学]