Design of bandwidth extension controller for MEMS ring gyroscope
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TH824

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    Abstract:

    This article designs a pole-zero compensation proportional-integral controller for the sense mode closed-loop control of MEMS ring vibration gyroscope. The relationships between the mechanical sensitivity and bandwidth of the ring gyroscope and the difference of resonant frequencies and the quality factor are analyzed. The effectiveness of pole-zero on the gyroscope bandwidth is analyzed by the bode diagram. A pole-zero compensation proportional-integral controller (PZ-PIC) is designed. By using this controller in the sense mode closed-loop circuit, the bandwidth of the gyroscope can be expanded. In this way, the contradiction between the mechanical bandwidth and mechanical sensitivity of the ring gyroscope is addressed. The proposed new controller has the advantages of few parameters and simple parameter determination, which is suitable for the mass production using MEMS gyroscopes. After experimental evaluation, the bandwidth of the three prototypes is effectively expanded, with the expanded bandwidth exceeding 90 Hz.

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  • Online: March 04,2025
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