Gyroscope that compensates for fluctuations in sensitivity
First Claim
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1. A method of compensating a gyroscope for bandwidth sensitivity, the method comprising:
- generating a test signal;
generating a quadrature error signal using a received Coriolis sense signal;
detecting a phase difference between the quadrature error signal and the test signal;
determining a bandwidth of the gyroscope based on the detected phase difference; and
compensating the gyroscope for bandwidth sensitivity by using the Coriolis sense signal and the bandwidth of the gyroscope.
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Abstract
A method compensates for a sensitivity of an inertial sensor having a resonator and an accelerometer. The method includes adding a test signal to a quadrature tuning voltage applied to the resonator of the inertial sensor. The method also includes receiving a quadrature error signal from the accelerometer of the inertial sensor. The method also includes detecting a phase difference between the quadrature error signal and the test signal. The method also includes determining a bandwidth of the accelerometer based on the detected phase difference, the bandwidth indicating the sensitivity of the accelerometer.
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Citations
20 Claims
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1. A method of compensating a gyroscope for bandwidth sensitivity, the method comprising:
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generating a test signal; generating a quadrature error signal using a received Coriolis sense signal; detecting a phase difference between the quadrature error signal and the test signal; determining a bandwidth of the gyroscope based on the detected phase difference; and compensating the gyroscope for bandwidth sensitivity by using the Coriolis sense signal and the bandwidth of the gyroscope. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. An apparatus for compensating a gyroscope for bandwidth sensitivity, the apparatus comprising:
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the gyroscope; and circuitry including; a test signal generator configured to generate a test signal; a phase difference detector configured to detect a phase difference between the test signal and a quadrature error signal generated using a Coriolis sense signal obtained from the gyroscope, a sensitivity gauge configured to determine a bandwidth of the gyroscope based on the phase difference; and a compensating circuit configured to compensate the gyroscope for bandwidth sensitivity by using the Coriolis sense signal and the determined bandwidth of the gyroscope. - View Dependent Claims (12, 13, 14, 15, 16)
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17. An apparatus, comprising:
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a gyroscope; and circuitry coupled to the gyroscope, the circuitry comprising; a phase difference detector coupled to an output of the gyroscope; an oscillator; a bandwidth detector coupled to an output of the oscillator and an output of the phase difference detector; and a compensating circuit coupled to the output of the gyroscope and to an output of the bandwidth detector. - View Dependent Claims (18, 19, 20)
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Specification