An Improved Phase Lock Loop for Micromechanical Gyroscope with a Carrier Modulation

Abstract:

This paper presents an improved phase lock loop for a micromechanical vibrating gyroscope with a carrier modulation. The loop keeps the gyroscope working at the resonant frequency of its drive mode. Digital signal processing is adopted in design of the loop and Xilinx virtex4 series FPGA is used. Compare with the conventional way, it decreases the resources in FPGA including registers, LUTs, and DSP48s. The realization shows a reduction of 51.06% for registers, 52.68% for LUTs and 18.18% for DSP48s. Besides, the loop has good portability for different devices which have different resonant frequencies due to the fabrication error. No adjustment is needed unlike the conventional loop whose reference phase has to be adjusted manually.

• Periodical: Key Engineering Materials (Volumes 562-565)
• Pages: 398-402
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.562-565.398
• Online since: July 2013
• Authors: Shi Chang Hu, Hui Jie Zhu, Ming Jun Ma, Yi Dong Liu, Zhong He Jin
• Keywords: Field-Programmable Gate Array (FPGA), Micromechanical Gyroscope, PLL

References

[1] L. Dachuan, N. N. Lu, J. Cui, L. T. Lin, H. T. Ding, Z. C. Yang, et al., "Digital closed-loop control based on adaptive filter for drive mode of a MEMS gyroscope," in IEEE Sensors, 2010, pp.1722-1726.

DOI: 10.1109/icsens.2010.5689902

[2] D. Lapadatu, B. Blixhavn, R. Holm, and T. Kvisteroy, "SAR500 - A high-precision high-stability butterfly gyroscope with north seeking capability," in IEEE/ION Position Location and Navigation Symposium (PLANS), 2010, pp.6-13.

DOI: 10.1109/plans.2010.5507139

[3] A. A. Trusov, A. R. Schofield, and A. M. Shkel, "Gyroscope architecture with structurally forced anti-phase drive-mode and linearly coupled anti-phase sense-mode," in TRANSDUCERS: Solid-State Sensors, Actuators and Microsystems, 2009, pp.660-663.

DOI: 10.1109/sensor.2009.5285411

[4] J. Bernstein, S. Cho, A. T. King, A. Kourepenis, P. Maciel, and M. Weinberg, "A micromachined comb-drive tuning fork rate gyroscope," in Proceedings An Investigation of Micro Structures, Sensors, Actuators, Machines and Systems. IEEE, 1993, pp.143-148.

DOI: 10.1109/memsys.1993.296932

[5] S. Sung, W. T. Sung, C. Kim, S. Yun, and Y. J. Lee, "On the Mode-Matched Control of MEMS Vibratory Gyroscope via Phase-Domain Analysis and Design," Ieee-Asme Transactions on Mechatronics, vol. 14, pp.446-455, Aug 2009.

DOI: 10.1109/tmech.2009.2023985

[6] M. F. Zaman, A. Sharma, F. Ayazi, and Ieee, "High performance matched-mode tuning fork gyroscope," in MEMS 2006: 19th IEEE International Conference on Micro Electro Mechanical Systems, Technical Digest, ed: New York, 2006, pp.66-69.

DOI: 10.1109/memsys.2006.1627737

[7] A. Sharma, M. F. Zaman, and F. Ayazi, "A Sub-0.2 degrees/hr Bias Drift Micromechanical Silicon Gyroscope With Automatic CMOS Mode-Matching," Ieee Journal of Solid-State Circuits, vol. 44, pp.1593-1608, 2009.

DOI: 10.1109/jssc.2009.2016996

[8] Z. Xia, Z. Xu-dong, H. Shi-chang, W. Hao, and J. Zhong-he, "Performance characterization of a bulk micromachined gyroscope working at atmosphere," in 3rd International Symposium on Systems and Control in Aeronautics and Astronautics (ISSCAA), 2010, pp.1246-1249.

DOI: 10.1109/isscaa.2010.5633470

[9] X. Zheng, Z. Jin, Y. Wang, X. Zhang, S. Hu, and L. Xu, "Process flow improvement on a bulk micromachined gyroscope," Micro & Nano Letters, vol. 4, pp.34-38, Mar 2009.

DOI: 10.1049/mnl:20080052

[10] X. d. Zheng, Z. h. Jin, Y. l. Wang, W. j. Lin, and X. q. Zhou, "An in-plane low-noise accelerometer fabricated with an improved process flow," Journal of Zhejiang University - Science A, vol. 10, pp.1413-1420, 2009.

DOI: 10.1631/jzus.a0820757