Gyroscope self test by applying rotation on Coriolis sense mass
First Claim
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1. A method of testing a gyroscope comprising:
- in response to a proof mass vibrating in a first direction at a drive frequency in a drive direction, generating a drive motion signal representative of a drive motion in a first direction;
applying a self-test signal to the proof mass, the self-test signal having a frequency substantially two times the drive frequency, the proof mass being rotated about an input axis using the signal at substantially two times the drive frequency, the applying the self-test signal to the proof mass causing rotation of the proof mass at substantially two times the drive frequency; and
in response to applying the self-test signal to the proof mass, detecting a change in a Coriolis force generated as a result of the rotation of the proof mass.
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Abstract
A self-test method by rotating the proof mass at a high frequency enables testing the functionality of both the drive and sense systems at the same time. In this method, the proof mass is rotated at a drive frequency. An input force which is substantially two times the drive frequency is applied to the actuation structures to rotate the proof mass of the gyroscope around the sensitive axis orthogonal to the drive axis. An output response of the gyroscope at the drive frequency is detected by a circuitry and a self-test response is obtained.
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Citations
17 Claims
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1. A method of testing a gyroscope comprising:
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in response to a proof mass vibrating in a first direction at a drive frequency in a drive direction, generating a drive motion signal representative of a drive motion in a first direction; applying a self-test signal to the proof mass, the self-test signal having a frequency substantially two times the drive frequency, the proof mass being rotated about an input axis using the signal at substantially two times the drive frequency, the applying the self-test signal to the proof mass causing rotation of the proof mass at substantially two times the drive frequency; and in response to applying the self-test signal to the proof mass, detecting a change in a Coriolis force generated as a result of the rotation of the proof mass. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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Specification