Design and Optimization of Sigma-Delta Accelerometer

Song Chen; Jian Yang; Wen Jie Fan; Qiang Fu; Xiao Wei Liu

doi:10.4028/www.scientific.net/KEM.609-610.1106

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HomeKey Engineering MaterialsKey Engineering Materials Vols. 609-610Design and Optimization of Sigma-Delta...

Design and Optimization of Sigma-Delta Accelerometer

Abstract:

Mathematical model of sensitive structures and detection principle of Sigma-Delta accelerometer are analyzed in this paper, and then an accelerometer with SNR 107dB is designed using MATLAB, the stability of which is analyzed based on root locus plot. When input is small than-3dBFS, the system is unsaturated. The poles and zeros of accelerometer noise transfer function are then analyzed and the feed-forward coefficient and local feedback coefficient are optimized, achieving a higher SNR of 112.1dB. At last, the circuit-level simulation is conducted and in-band noise level is about-140dB.

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Periodical:

Key Engineering Materials (Volumes 609-610)

Pages:

1106-1110

DOI:

https://doi.org/10.4028/www.scientific.net/KEM.609-610.1106

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Online since:

April 2014

Authors:

Song Chen*, Jian Yang, Wen Jie Fan, Qiang Fu, Xiao Wei Liu

Keywords:

Accelerometer, Optimization, Sigma-Delta

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* - Corresponding Author

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