Back to results
US 12,422,280 B2Granted
Method for correcting gyroscope demodulation phase drift
AssigneeSTMicroelectronics S.r.l.
InventorsLuca Guerinoni, Gabriele Gattere
Life of this patent
Estimating the term…
Abstract
A gyroscopic sensor unit detects a phase drift between a demodulated output signal and demodulation signal during output of a quadrature test signal. A delay calculator detects the phase drift based on changes in the demodulated output signal during application of the quadrature test signal. A delay compensation circuit compensates for the phase drift by delaying the demodulation signal by the phase drift value.
Claims20
A device, comprising:
- a gyroscope;
- and
- a quadrature compensation driver coupled to the gyroscope, the quadrature compensation driver configured to apply a test signal to the gyroscope during a testing period, applying the test signal during the testing period to the gyroscope includes applying a first phase of the test signal with a first polarity during a first period of the testing period, reversing the test signal to a second polarity opposite to the first polarity, and applying a second phase of the test signal with the second polarity during a second period of the testing phase following the first period.
A method, comprising:
- driving a resonator mass of a gyroscope in a first direction by applying a first drive signal to a drive electrode;
- applying a test voltage to a quadrature compensation electrode adjacent to the resonator mass;
- determining a phase difference between a first drive reference signal and an output signal of the gyroscope based on a change in the output signal during application of the test voltage;
- generating a raw output signal from the gyroscope;
- generating the output signal by performing coherent demodulation between the raw output signal and a second drive reference signal based on the first drive reference signal;
- and
- compensating for the phase difference between the first drive reference signal and the output signal of the gyroscope, and compensating for the phase difference includes generating the second drive reference signal by delaying the first drive reference signal by the phase difference.
4 more elements
A method, comprising:
- when oscillating a resonator mass by driving the resonator mass, applying a test voltage to a quadrature compensation electrode adjacent to the resonator mass;
- and
- reversing polarity of the test voltage during application of the test voltage to the quadrature compensation electrode.
Dependencies are inferred from the claim text.