A novel method for finding the best excitation frequency of MEMS vibratory gyroscope

Mohammadi, Meghdad; Kaabi, Hooman; Ansari-Asl, Karim

doi:10.1007/s00542-017-3552-0

Cited by 5 publications

(7 citation statements)

References 14 publications

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“…When the frequency difference continues to increase to 400 Hz, we found that the locking time becomes longer, but the locking time required by our method is still relatively short, which is compared with the corresponding value in (Mohammadi et al , 2018; He et al , 2014). Mohammadi et al (2018) found the proper excitation signal frequency after 2.1 s at excitation frequency 73,412 Hz. In He et al (2014), the frequency reaches a balanced point of resonance after 900 s.…”

Section: Modeling and Simulation Of The Drive Control Systemmentioning

confidence: 78%

“…According to the working principle of Coriolis vibratory gyroscope, as long as the amplitude of vibration velocity is kept constant, the relationship between Coriolis force and input angular rate can be linear (Liu et al , 2012). Mohammadi et al (2018) stated that the large drive mode amplitude will increase the sensitivity of gyroscopes. To ensure the detection accuracy of gyroscope, it is necessary to ensure the stability of driving frequency and amplitude of vibration velocity (Li et al , 2016).…”

Section: Introductionmentioning

confidence: 99%

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A method to improve tracking ability of drive control of MEMS gyroscopes

Chen

Zhu

Mou

et al. 2021

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Purpose A high-precision gyroscope is an important tool for accurate positioning, and the amplitude stability and frequency tracking ability of the drive control system are important and necessary conditions to ensure the precision of micro-electro-mechanical systems (MEMS) gyroscopes. To improve the precision of MEMS gyroscopes, this paper proposes a method to improve the amplitude stability and frequency tracking ability of a drive control system. Design/methodology/approach A frequency tracking loop and an amplitude control loop are proposed to improve the frequency tracking ability and amplitude stability of the drive control system for a MEMS gyroscopes. The frequency tracking loop mainly includes a phase detector, a frequency detector and a loop filter. And, the amplitude control loop mainly includes an amplitude detector, a low-pass filter and an amplitude control module. The simulation studies on the frequency tracking loop, amplitude control loop and drive control system composed of these two loops are implemented. The corresponding digital drive control algorithm is realized by the Verilog hardware description language, which is downloaded to the application-specific integrated circuits (ASIC) platform to verify the performances of the proposed method. Findings The simulation experiments in Matlab/Simulink and tests on the ASIC platform verify that the designed drive control system can keep the amplitude stable and track the driving frequency in real time with high precision. Originality/value This study shows a way to design and realize a drive control system for MEMS gyroscopes to improve their tracking ability. It is helpful for improving the precision of MEMS gyroscopes.

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Section: Modeling and Simulation Of The Drive Control Systemmentioning

confidence: 78%

Section: Introductionmentioning

confidence: 99%

A method to improve tracking ability of drive control of MEMS gyroscopes

Chen

Zhu

Mou

et al. 2021

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show abstract

“…We have listed the reported values of the corresponding methods in those papers. (11)(12)(13) It can be seen from Table 1 that our proposed drive control method has advantages over other methods in terms of stabilization precision.…”

Section: Results On Digital Asic Platformmentioning

confidence: 99%

“…It is clear that the output amplitude increases and the output frequency is closer to the resonant frequency, as determined by using our proposed method. Results of the comparison of our proposed method with other similar methods (11)(12)(13) are shown in Table 1. We have listed the reported values of the corresponding methods in those papers.…”

Section: Results On Digital Asic Platformmentioning

confidence: 99%

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A Drive Control Method for Silicon Micro-gyroscopes

Zhu¹,

Chen²,

Hua³

et al. 2020

Sensors and Materials

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The tracking ability of a silicon micro-gyroscope in a highly dynamic environment is a key factor for MEMS and inertial technology. To improve the tracking ability in a highly dynamic environment, a new drive control method for silicon micro-gyroscopes is proposed. First, a double closed-loop system with a phase-locked loop (PLL) and an automatic gain control (AGC) is designed to track the resonant frequency and stabilize the output amplitude. Second, the framework and corresponding algorithm of a second-order frequency-locked loop (FLL)-assisted third-order PLL were designed. Thereafter, the tracking performance characteristics of a thirdorder PLL and the proposed second-order-FLL-assisted third-order PLL at different frequency differences were simulated in Matlab Simulink. Simulation results show that the second-order-FLL-assisted third-order PLL can track the resonant frequency in a shorter time with a higher precision than the third-order PLL, and that the proposed method can still lock the resonant frequency of 11570 Hz when the frequency difference increases to 400 Hz, demonstrating its applicability in highly dynamic environments. Finally, the digital application specific integrated circuit (ASIC) test platform further validates the effectiveness of our proposed drive control method.

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