Method and apparatus for a micromachined multisensor
First Claim
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1. A method of detecting displacement of a MEMS structure, the method including:
- providing at least one drive capacitor for electrostatically driving the MEMS structure, wherein the capacitance of the at least one drive capacitor varies as a function of the displacement of the MEMS structure;
charging the at least one drive capacitor;
measuring the electrical charge on the at least one drive capacitor; and
determining the displacement of the MEMS structure as a function of the electrical charge measured on the at least one drive capacitor.
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Abstract
In a micromachined devices having a movable shuttle driven in oscillation, measuring the electrical charge accumulated on opposing drive capacitors to determine the displacement of the movable shuttle. Alternately, in such a micromachined device, measuring the electrical charge accumulated on a drive capacitor and comparing the measured electrical charge to a nominal electrical charge to determine the displacement of the movable shuttle.
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Citations
18 Claims
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1. A method of detecting displacement of a MEMS structure, the method including:
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providing at least one drive capacitor for electrostatically driving the MEMS structure, wherein the capacitance of the at least one drive capacitor varies as a function of the displacement of the MEMS structure; charging the at least one drive capacitor; measuring the electrical charge on the at least one drive capacitor; and determining the displacement of the MEMS structure as a function of the electrical charge measured on the at least one drive capacitor. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method of detecting the in-phase displacement of two MEMS structures oscillating in antiphase, the method including:
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providing a first MEMS structure having a first drive capacitor and an opposing second drive capacitor; providing a second MEMS structure having a third drive capacitor and an opposing fourth drive capacitor; driving the first drive capacitor and the third drive capacitor with a first periodic drive signal having a high phase and a low phase; driving the second drive capacitor and the fourth drive capacitor with a second periodic drive signal having a high phase and a low phase, where the second periodic signal is the inverse of the first periodic signal; and measuring the discharge current from the first drive capacitor and the third drive capacitor during the low phase of the first drive signal. - View Dependent Claims (12, 13, 14)
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15. An apparatus for determining acceleration, the apparatus comprising:
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a movable mass; at least one drive capacitor for receiving an electrostatic force and vibrating the movable mass in response to the received electrostatic force; and a measuring circuit operatively coupled with the at least one drive capacitor, the measuring circuit measuring the electrical charge on the at least one drive capacitor and producing a signal representing acceleration as a function of the measured electrical charge. - View Dependent Claims (16, 17, 18)
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Specification