Gyroscope that compensates for fluctuations in sensitivity
AssigneeAnalog Devices, Inc.
InventorJeffrey A. Gregory
Life of this patent
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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.
Claims20
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.
An apparatus for compensating a gyroscope for bandwidth sensitivity, the apparatus comprising:
- 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.
An apparatus, comprising:
- 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.
Dependencies are inferred from the claim text.