ADJUSTING A MEMS GYROSCOPE TO REDUCE THERMALLY VARYING BIAS
First Claim
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1. A method for calibrating a micro-electro-mechanical system (MEMS) vibrating structure gyroscope, the method comprising:
- obtaining an indication of a position of at least one proof mass with respect to at least one drive electrode; and
applying an electrostatic force to the at least one proof mass as a function of the indication, the electrostatic force configured to position the at least one proof mass in a first position with respect to at least one drive electrode.
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Abstract
A method for calibrating a micro-electro-mechanical system (MEMS) vibrating structure gyroscope is provided. The method includes obtaining an indication of a position of at least one proof mass with respect to at least one drive electrode and applying an electrostatic force to the at least one proof mass as a function of the indication, the electrostatic force configured to position the at least one proof mass in a first position with respect to at least one drive electrode.
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Citations
20 Claims
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1. A method for calibrating a micro-electro-mechanical system (MEMS) vibrating structure gyroscope, the method comprising:
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obtaining an indication of a position of at least one proof mass with respect to at least one drive electrode; and applying an electrostatic force to the at least one proof mass as a function of the indication, the electrostatic force configured to position the at least one proof mass in a first position with respect to at least one drive electrode. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A vibratory structure gyroscope, the gyroscope comprising:
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at least one proof mass having a first at least one comb, the at least one proof mass having a planar structure disposed orthogonal to a sense axis; at least one drive electrode having a second at least one comb, the second at least one comb configured to engage the first at least one comb; a first electrode opposing a first side of the at least one proof mass and a second electrode opposing a second side of the at least one proof mass, wherein the first side and second side of the at least one proof mass are orthogonal to the sense axis; and a control circuit configured to; apply a first direct current (DC) voltage to the first electrode and a second DC voltage to the second electrode in order to adjust a position along the sense axis of the at least one comb of the at least one proof mass with respect to a position along the sense axis of the at least one comb of the at least one drive electrode. - View Dependent Claims (14, 15, 16, 17)
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18. A method for calibrating a micro-electro-mechanical system (MEMS) vibrating structure gyroscope, the method comprising:
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applying a test signal to at least one drive electrode; systematically applying different test electrostatic forces to at least one proof mass; measuring capacitances between the at least one drive electrode and the at least one proof mass to obtain a plurality of capacitances corresponding to the different test electrostatic forces; selecting a first electrostatic force of the different electrostatic forces, the first electrostatic forces corresponding to a largest capacitance of the capacitances; and applying the first electrostatic force to the at least one proof mass during operation of the at least one proof mass. - View Dependent Claims (19, 20)
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Specification