US 12,031,821 B2
Compensating a temperature-dependent quadrature-induced zero rate offset for a microelectromechanical gyroscope
Andrea Visconti, Munich (DE); Francesco Diazzi, Munich (DE); and Ruslan Khalilyulin, Munich (DE)
Assigned to ROBERT BOSCH GMBH, Stuttgart (DE)
Appl. No. 17/906,304
Filed by Robert Bosch GmbH, Stuttgart (DE)
PCT Filed Apr. 16, 2021, PCT No. PCT/EP2021/059931
§ 371(c)(1), (2) Date Sep. 14, 2022,
PCT Pub. No. WO2021/244800, PCT Pub. Date Dec. 9, 2021.
Claims priority of application No. 10 2020 206 919.0 (DE), filed on Jun. 3, 2020.
Prior Publication US 2023/0009227 A1, Jan. 12, 2023
Int. Cl. G01C 19/5776 (2012.01); G01C 19/5712 (2012.01)
CPC G01C 19/5712 (2013.01) [G01C 19/5776 (2013.01)] 10 Claims
OG exemplary drawing
 
1. A sensor system, comprising:
an analog processing arrangement including:
a drive circuit configured to generate an analog drive signal to drive an oscillating element of a microelectromechanical gyroscope,
a detection circuit coupled to the drive circuit and the oscillating element, the detection circuit being configured to generate an analog rotation-rate signal and an analog quadrature signal from a signal detected by the gyroscope;
at least one analog-to-digital converter coupled to the detection circuit and configured to convert the analog rotation-rate signal and the analog quadrature signal into a digital rotation-rate signal and a digital quadrature signal, respectively, and
a compensation circuit, which, in a measurement operating mode of the sensor system, is configured to compensate a quadrature effect on the analog quadrature signal using at least one quadrature compensation value;
a digital processing arrangement coupled to the analog processing arrangement, the digital processing arrangement including a digital processing circuit, wherein the digital processing circuit, in the measurement operating mode of the sensor system, is configured to compensate a temperature-dependent quadrature-induced zero rate offset ZRO of the digital rotation-rate signal using at least one ZRO compensation value and temperature information, and
a control device configured to switch between the measurement operating mode and a ZRO trimming mode in which the compensation circuit is selectively deactivated and re-activated, and in which there is no compensation of the temperature-dependent quadrature-induced offset of the digital rotation-rate signal.