[1] Zhou Wei, Cai Tijing,. Analysis and design of sigma-delta interface circuitfor quartz flexural pendulum accelerometer [J]. Journal of Southeast University (English Edition), 2011, 27 (3): 266-269. [doi:10.3969/j.issn.1003-7985.2011.03.008]

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Analysis and design of sigma-delta interface circuitfor quartz flexural pendulum accelerometer()

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Journal of Southeast University (English Edition)[ISSN:1003-7985/CN:32-1325/N]

Volumn:

27

Issue:

2011 3

Page:

266-269

Research Field:

Other Disciplines

Publishing date:

2011-09-30

Info

Title:

Analysis and design of sigma-delta interface circuitfor quartz flexural pendulum accelerometer

Author(s):

Zhou Wei;  Cai Tijing

School of Instrument Science and Engineering, Southeast University, Nanjing 210096, China

Keywords:

switched-capacitor(SC)circuit;  sigma-delta modulator(SDM);  high resolution;  non-ideality;  low power

PACS:

V411;U666.1

DOI:

10.3969/j.issn.1003-7985.2011.03.008

Abstract:

For the high resolution required in a digital interface circuit of an accelerometer used in feeble gravity measurement, a switched-capacitor(SC)sigma-delta modulator(SDM)is proposed. Based on the principle and the topology structure of the SDMs, the influence of oversampling ratio, bits of an internal quantizer and the cascaded structure on weak signal detecting precision is analyzed, and an ideal low-distortion SDM with a second-order 1-bit structure satisfying the high-resolution interface circuit of an accelerometer is designed. With the research on non-idealities of each SDM block in the SC circuit implementation and their impacts on power consumption, the realized parameters of low-power SDMs based on different bandwidths are devised and the power consumption of each SDM is estimated. Time-domain behavioral simulation is explored based on Simulink. The results demonstrate that a 21-bit resolution of the designed SDMs can be achieved on the premise of low power, and the parameters for the circuit implementation can be directed to the transistor-level circuit design.

References:

[1] Zhang Changda, Dong Haobin. A new development period of the gravity and magnetic exploration[J]. Geophysical and Geochemical Exploration, 2010, 34(1): 1-7.(in Chinese)
[2] Xia Zheren, Shi Pan, Sun Zhongmiao, et al. Chinese airborne gravimetry system CHAGS[J]. Acta Geodaetica Et Cartographic Sinica, 2004, 33(3): 216-220.(in Chinese)
[3] Cai Tijing, Zhou Bailing. Status and prospects of gravity gradiometers[J]. Journal of Chinese Inertial Technology, 1999, 7(1):39-42.(in Chinese)
[4] Yang Gongliu, Liu Yangxi, Li Xiaoping. Analysis and design on control loops of gravity gradiometer accelerometer[J].Journal of Chinese Inertial Technology, 2009, 17(2): 145-147.(in Chinese)
[5] Liu Run, Cai Tijing, Ding Hao.Design and analysis of closed-loop system of high resolution flexure pendulum accelerometer[J]. Journal of Southeast University: Natural Science Edition, 2010, 40(2):311-315.(in Chinese)
[6] Wang Chun’ai. Structure design of a high precision accelerometer[D]. Nanjing, China: Southeast University, 2009.(in Chinese)
[7] Schreier R, Temes G C. Understanding delta-sigma data converters [M]. New York: John Wiley & Sons, 2004.
[8] Medeiro F, Pérez-Verdú B, Rodríguez-Vizquez A, et al. Modeling OpAmp-induced harmonic distortion for switched-capacitor SDM design[C]//Proceedings of the 1994 IEEE International Symposium on Circuits and Systems. London, 1994: 445-448.
[9] Medeiro F, Pérez-Verdú B, Rodríguez-Vizquez A. Top-down design of high-performance sigma-delta modulators[M]. Boston: Kluwer Academic Publishers, 1999.
[10] Brigati S, Francesconi F, Malcovati P, et al. Modeling sigma-delta modulator non-idealities in SIMULINK[C]//Proceedings of the 1999 IEEE International Symposium on Circuits and Systems. Orlando, FL, USA, 1999: 384-387.
[11] Peluso V, Steyaert M, Sansen W. Design of low-voltage low-power CMOS delta-sigma A/D converters[M]. Boston: Kluwer Academic Publishers, 1999.

Memo

Memo:

Biographies: Zhou Wei(1984—), female, graduate; Cai Tijing(corresponding author), male, doctor, professor, caitij@seu.edu.cn.
Foundation item: The National High Technology Research and Development Program of China(863 Program)(No.2006AA12Z302).
Citation: Zhou Wei, Cai Tijing. Analysis and design of sigma-delta interface circuit for quartz flexural pendulum accelerometer[J].Journal of Southeast University(English Edition), 2011, 27(3):266-269.[doi:10.3969/j.issn.1003-7985.2011.03.008]

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