Temperature-robust MEMS gyroscope with 2-DOF sense-mode addressing the tradeoff between bandwith and gain
First Claim
1. A 3-degree of freedom (DOF) dynamic gyroscopic system comprising:
- an outer frame;
a central anchor;
a detection mass coupled to the central anchor and to a proof mass disposed around the detection mass;
a 1-DOF drive subsystem comprising a pair of drive-mode shuttles;
a 2-DOF sense subsystem comprising a pair of sense-mode shuttles; and
a suspension subsystem,wherein the suspension subsystem comprises a first plurality of springs coupling the drive subsystem to the outer frame and to the proof mass and a second plurality of springs coupling the sense subsystem to the outer frame and to the proof mass.
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Abstract
The current invention is a novel gyroscope design, which yields devices robust to fabrication and environmental variations, allows flexible selection of operational parameters, and provides increased bandwidth with minimized sacrifice in gain regardless of the selected frequency of operation. The gyroscope has a single degree-of-freedom (DOF) drive-mode and a 2-DOF sense-mode. The drive-mode operational frequency and the sense-mode bandwidth can be selected arbitrarily in the proposed design, relaxing the tradeoff between the gain, die size, and detection capacitance. The symmetry of the structure ensures the optimal location of the drive-mode resonance relative to the sense-mode operational region, even in presence of fabrication imperfections.
13 Citations
11 Claims
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1. A 3-degree of freedom (DOF) dynamic gyroscopic system comprising:
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an outer frame; a central anchor; a detection mass coupled to the central anchor and to a proof mass disposed around the detection mass; a 1-DOF drive subsystem comprising a pair of drive-mode shuttles; a 2-DOF sense subsystem comprising a pair of sense-mode shuttles; and a suspension subsystem, wherein the suspension subsystem comprises a first plurality of springs coupling the drive subsystem to the outer frame and to the proof mass and a second plurality of springs coupling the sense subsystem to the outer frame and to the proof mass. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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Specification