Triple Mass Resonator for Electrostatic Quality Factor Tuning

In this paper, a triple mass resonator (TMR) with a high capability to independently tune both resonant frequency and quality factor (Q-factor) is reported. An additive oscillating structure is designed into a conventional dual-mass resonator to control the modal shape. The theoretical studies revea...

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Bibliographic Details
Published in:Journal of microelectromechanical systems 2022-04, Vol.31 (2), p.194-203
Main Authors: Chen, Jianlin, Tsukamoto, Takashiro, Tanaka, Shuji
Format: Article
Language:English
Subjects:
Bias
Coupled modes
Couplings
frequency tuning
Gyroscopes
Oscillators
Q factors
Q-factor
Q-factor tuning
Resonant frequencies
Resonant frequency
Resonators
Springs
Springs (elastic)
Stiffness
Tuning
Tuning fork resonator
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Summary:In this paper, a triple mass resonator (TMR) with a high capability to independently tune both resonant frequency and quality factor (Q-factor) is reported. An additive oscillating structure is designed into a conventional dual-mass resonator to control the modal shape. The theoretical studies revealed that the amplitude ratio between the outer masses, which mainly determine the Q-factor through the anchor loss, is sensitive to both suspension and inner springs because of mode coupling, while the resonant frequency is only sensitive to the suspension spring. Through this mechanism, the quality factor related to the anchor loss, Q_{\mathrm {Anchor}} , can be adjusted by electrostatic tuning of the inner spring, while the resonant frequency keeps almost constant. On the other hand, the eigenfrequency could be significantly tuned by the electrostatic tuning of the suspension spring. The experimental results showed the Q-factor could be tuned as large as 19% by a DC bias of 15 V at the inner electrode, while the resonant frequency change was only as small as 162 ppm. In contrast, when the DC bias was applied to soften the suspension stiffness, the resonant frequency could be tuned as high as 7023 ppm with Q-factor change of 16%. [2021-0167]
ISSN:1057-7157
1941-0158
DOI:10.1109/JMEMS.2021.3138530