Resonator and method of controlling the same
First Claim
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1. A resonator comprising:
- a resonator body;
an actuation electrode that is configured to drive the resonator into a resonant mode in which the resonator body vibrates parallel to a first axis; and
a detection arrangement that is configured to detect the vibration in the first axis direction and generate an electrical output signal derived from the vibration, wherein the resonator comprises an element configured to apply a bias voltage to the resonator body, using at least one bias electrode separated from the resonator body by a non-conductive gap extending in a direction perpendicular to the first axis direction, wherein the application of the bias voltage shifts an eigenfrequency of a parasitic mode.
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Abstract
A resonator comprising a resonator body and actuation electrodes for driving the resonator into a resonant mode, in which the resonator body vibrates parallel to a first axis. The resonator comprises means to apply a voltage to the resonator in a direction perpendicular to the first axis direction. This serves to shift the frequency of resonant modes other than the principal resonant mode, and this allows increased amplitude of output signal from the resonator.
25 Citations
15 Claims
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1. A resonator comprising:
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a resonator body; an actuation electrode that is configured to drive the resonator into a resonant mode in which the resonator body vibrates parallel to a first axis; and a detection arrangement that is configured to detect the vibration in the first axis direction and generate an electrical output signal derived from the vibration, wherein the resonator comprises an element configured to apply a bias voltage to the resonator body, using at least one bias electrode separated from the resonator body by a non-conductive gap extending in a direction perpendicular to the first axis direction, wherein the application of the bias voltage shifts an eigenfrequency of a parasitic mode. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method of controlling a resonator which comprises a resonator body and an actuation electrode for driving the resonator into a resonant mode, in which the resonator body vibrates parallel to a first axis, the method comprising:
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applying a bias voltage to the resonator body, using at least one bias electrode separated from the resonator body by a non-conductive gap extending in a direction perpendicular to the first axis direction, wherein the application of the bias voltage shifts an eigenfrequency of a parasitic mode; detecting the vibration in the first axis direction; and generating an electrical output signal derived from the vibration. - View Dependent Claims (13, 14, 15)
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Specification