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• W3049203857 endingPage "4564" @default.
• W3049203857 startingPage "4564" @default.
• W3049203857 abstract "Traditional MEMS gyroscope readout eliminates quadrature error and relies on the phase relationship between the drive displacement and the Coriolis position to accomplish a coherent demodulation. This scheme shows some risk, especially for a mode-matching gyro. If only a slight resonant frequency deviation between the drive and sense mode occurs, a dramatic change in the phase relationship follows, which leads to a wrong demodulation. To solve this, this paper proposes a new readout based on the quadrature error and an auxiliary phase-locked loop (PLL). By tuning the phase shifter in the sense-mode circuit, letting the quadrature error and the carrier of the mixer be in 90° phase alignment, the Coriolis was simultaneously in phase with the carrier. Hence, the demodulation was accomplished. The carrier comes from the PLL output of the drive-mode circuit due to its low jitter and independence of the work mode of the gyro. Moreover, an auxiliary PLL is used to filter the quadrature error to enhance the phase alignment accuracy. Through an elaborate design, a printed circuit board was used to verify the proposed idea. The experimental results show the readout circuit functioned well. The scale factor of the gyro was 6.8 mV/°/s, and the bias instability was 204°/h." @default.
• W3049203857 created "2020-08-21" @default.
• W3049203857 creator A5071781931 @default.
• W3049203857 creator A5079342155 @default.
• W3049203857 date "2020-08-14" @default.
• W3049203857 modified "2023-10-16" @default.
• W3049203857 title "Design of Readout Circuit with Quadrature Error and Auxiliary PLL for MEMS Vibratory Gyroscope" @default.
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• W3049203857 doi "https://doi.org/10.3390/s20164564" @default.
• W3049203857 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/7472230" @default.
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• W3049203857 hasPublicationYear "2020" @default.
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