Back to results
US 2023/0068616 A1Published application
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 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;
- and
- compensating for the phase difference between the first drive reference signal and the output signal of the gyroscope.
2 more elements
A device, comprising:
- a gyroscope;
- a demodulator having:
- a first input coupled to the gyroscope;
- a second input;
- and
- an output;
- delay calculator coupled to an output of the demodulator;
- and
- a delay compensation circuit coupled to the delay calculator and the second input of the demodulator.
6 more elements
A gyroscope sensor unit, comprising:
- a quadrature driver configured to output a quadrature test signal;
- a sensor electrode configured to generate a raw output signal;
- a demodulator configured to receive the raw output signal and a drive reference signal and to generate a demodulated signal based on the drive reference signal and the raw output signal;
- and
- a delay calculator configured to calculate a phase drift value between the demodulated signal and the drive reference signal based on changes in the demodulated signal during output of the quadrature test signal.
2 more elements
Dependencies are inferred from the claim text.