Patent ID: 11867509
Assignee: INVENSENSE, INC.
Field: Measurement (Instruments)
Classification: CPC G  B | IPC B  G

Claim 12:
13. A microelectromechanical system (MEMS) gyroscope, comprising:
a suspended spring-mass system located in a MEMS layer, wherein the suspended spring-mass system comprises a first driven mass and a second driven mass, wherein the first driven mass comprises at least one first driven mass sense electrode responsive to a movement of the first driven mass in a first direction and a first drive amplitude electrode facing in a second direction that is perpendicular to the first direction, and wherein the second driven mass comprises at least one second driven mass sense electrode responsive to a movement of the second driven mass in the first direction and a second drive amplitude electrode facing in the second direction;
at least one first fixed drive sense electrode located in the MEMS layer adjacent to the at least one first driven mass sense electrode and configured to capacitively engage with the first driven mass sense electrode based on the movement of the first driven mass in the first direction to generate a first drive sense signal;
at least one second fixed drive sense electrode located in the MEMS layer adjacent to the at least one second driven mass sense electrode and configured to capacitively engage with the second driven mass sense electrode based on the movement of the second driven mass in the first direction to generate a second drive sense signal;
a first fixed drive amplitude sense electrode located in the MEMS layer adjacent to the first driven mass and configured to capacitively engage with the first drive amplitude electrode based on the movement of the first driven mass in the first direction;
a second fixed drive amplitude sense electrode located in the MEMS layer adjacent to the second driven mass and configured to capacitively engage with the second drive amplitude electrode based on the movement of the second driven mass in the first direction;
processing circuitry configured to receive a first drive amplitude signal based on a first overlap of the first drive amplitude electrode and the first fixed drive amplitude sense electrode, monitor a change in the received first drive amplitude signal, determine a first drive reference signal based on the monitored change of the received first drive amplitude signal, and determine a first drive motion of the first driven mass based on the first drive sense signal and the first drive reference signal, and wherein the processing circuitry is further configured to receive a second drive amplitude signal based on a second overlap of the received second drive amplitude electrode and the second fixed drive amplitude sense electrode, monitor a change in the received second drive amplitude signal, determine a second drive reference signal based on the monitored change of the second drive amplitude signal, and determine a second drive motion of the second driven mass based on the second drive sense signal and the second drive reference signal.