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Supervised by Ministry of Industry and Information Technology of The People's Republic of China Sponsored by Harbin Institute of Technology Editor-in-chief Yu Zhou ISSNISSN 1005-9113 CNCN 23-1378/T

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Related citation:Guanshi Wang,Xiaowei Liu,Changchun Dong.A Low-Noise Readout Circuit for Gyroscopes[J].Journal of Harbin Institute Of Technology(New Series),2015,22(5):42-45.DOI:10.11916/j.issn.1005-9113.2015.05.007.
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A Low-Noise Readout Circuit for Gyroscopes
Author NameAffiliation
Guanshi Wang Micro-Electromechanical System Center, Harbin Institute of Technology, Harbin 150001, China 
Xiaowei Liu Micro-Electromechanical System Center, Harbin Institute of Technology, Harbin 150001, China 
Changchun Dong Micro-Electromechanical System Center, Harbin Institute of Technology, Harbin 150001, China 
Abstract:
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 pF, and the noise at resonant frequency (4 kHz) is 133 nV/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.
Key words:  low-noise  noise optimization  charge amplifier  gyroscope  readout
DOI：10.11916/j.issn.1005-9113.2015.05.007
Clc Number:TN492
Fund:

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