US 11,668,585 B2
Method for correcting gyroscope demodulation phase drift
Luca Guerinoni, Alzano Lombardo (IT); and Gabriele Gattere, Castronno (IT)
Assigned to STMICROELECTRONICS S.R.L., Agrate Brianza (IT)
Filed by STMICROELECTRONICS S.R.L., Agrate Brianza (IT)
Filed on Aug. 27, 2021, as Appl. No. 17/460,030.
Prior Publication US 2023/0068616 A1, Mar. 2, 2023
Int. Cl. G01C 25/00 (2006.01); G01C 19/72 (2006.01)
CPC G01C 25/005 (2013.01) [G01C 19/726 (2013.01)] 20 Claims
OG exemplary drawing
 
1. 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;
reversing a polarity of the test voltage during application of the test voltage;
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.