Angular velocity detection circuit and angular velocity detection apparatus
First Claim
1. A circuit for use in a physical quantity detection device, comprising:
- a self-vibration component extraction unit that receives, from a resonator, a signal that includes (i) a first component corresponding to a magnitude of a physical quantity, and (ii) a second component based on an excited vibration, the self-vibration component extraction unit extracting the second component from the signal;
a direct-current conversion unit that includes an integration unit that integrates an output signal of the self-vibration component extraction unit;
an offset addition unit that adds an offset value to an output signal of the direct-current conversion unit; and
a determination unit that monitors and determines the output signal of the offset addition unit or the direct-current conversion unit.
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Abstract
An angular velocity detection circuit is connected to a resonator for making excited vibration on the basis of a drive signal and detects an angular velocity. The angular velocity detection circuit includes: a self-vibration component extraction unit that receives, from the resonator, a detection signal including an angular velocity component based on a Coriolis force and a self-vibration component based on the excited vibration of the resonator and extracts the self-vibration component from the detection signal; a direct-current conversion unit including an integration unit that integrates an output signal of the self-vibration component extraction unit; and an offset addition unit that adds an offset value to an output signal of the direct-current conversion unit.
18 Citations
20 Claims
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1. A circuit for use in a physical quantity detection device, comprising:
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a self-vibration component extraction unit that receives, from a resonator, a signal that includes (i) a first component corresponding to a magnitude of a physical quantity, and (ii) a second component based on an excited vibration, the self-vibration component extraction unit extracting the second component from the signal; a direct-current conversion unit that includes an integration unit that integrates an output signal of the self-vibration component extraction unit; an offset addition unit that adds an offset value to an output signal of the direct-current conversion unit; and a determination unit that monitors and determines the output signal of the offset addition unit or the direct-current conversion unit. - View Dependent Claims (2, 3, 4)
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5. A circuit for use in a physical quantity detection device, comprising:
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a self-vibration component extraction unit that receives, from a resonator, a signal that includes (i) a first component corresponding to a magnitude of a physical quantity, and (ii) a second component based on an excited vibration, the self-vibration component extraction unit extracting the second component from the signal, and an offset addition unit that adds an offset value to an output signal of the self-vibration component extraction conversion unit. - View Dependent Claims (6, 7, 8, 9)
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10. A physical quantity detection device, comprising:
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a resonator that generates a signal that includes (i) a first component corresponding to a magnitude of the physical quantity, and (ii) a second component based on an excited vibration; a self-vibration component extraction unit that receives the signal and extracts the second component from the signal; a direct-current conversion unit that includes an integration unit that integrates an output signal of the self-vibration component extraction unit; an offset addition unit that adds an offset value to an output signal of the direct-current conversion unit; and a determination unit that monitors and determines an output signal of the offset addition unit or the direct-current conversion unit. - View Dependent Claims (11, 12, 13, 14)
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15. A physical quantity detection device, comprising:
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a resonator that generates a signal that includes (i) a first component corresponding to a magnitude of a physical quantity and (ii) a second component based on an excited vibration; a self-vibration component extraction unit that receives the signal and extracts the second component from the signal; and an offset addition unit which adds an offset value to an output signal of the self-vibration component extraction unit. - View Dependent Claims (16, 17, 18, 19, 20)
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Specification