Patent ID: 11879906
Assignee: INVENSENSE, INC.
Field: Measurement (Instruments)
Classification: CPC G | IPC G

Claim 20:
21. A method for monitoring a suspended spring-mass system and identifying a frequency of an external vibration by a microelectromechanical system (MEMS) inertial sensor, comprising:
generating, by processing circuitry of the MEMS inertial sensor, a frequency scan signal pattern comprising a plurality of periodic signal portions each having a test frequency;
providing the frequency scan signal pattern to a self-test drive electrode of the MEMS inertial sensor;
driving, by the self-test drive electrode, a proof mass of the suspended spring-mass system based on the frequency scan signal pattern;
sensing, by one or more sense electrodes of the inertial sensor, a movement of a proof mass of the inertial sensor over a period of time during which the frequency scan pattern drives the proof mass;
generating, by the processing circuitry of the inertial sensor, a sense signal based on the sensed movement of the proof mass over the period of time;
correlating, by the processing circuitry, the sense signal with the frequency scan signal pattern;
identifying, by the processing circuitry, a frequency associated with the external vibration based on the correlating; and
identifying, by the processing circuitry, an error associated with the suspended spring-mass system based on the correlating.