Patent ID: 11965906
Assignee: STMICROELECTRONICS S.R.L.
Field: Measurement (Instruments)
Classification: CPC G | IPC G

Claim 10:
11. An electronic system, comprising:
processing circuitry; and
a closed-loop microelectromechanical accelerometer coupled to the processing circuitry, the accelerometer including:
a supporting body;
an out-of-plane sensing mass of semiconductor material having a first side facing the supporting body and a second side opposite to the first side, the out-of-plane sensing mass is connected to the supporting body to oscillate around a non-barycentric fulcrum axis parallel to the first side and to the second side and perpendicular to an out-of-plane sensing axis;
a first and second through opening extending through the out-of-plane sensing mass;
feedback supports including respective first structures being anchored to the supporting body and extending in a direction parallel to the out-of-plane sensing axis through the first and second through openings in the out-of-plane sensing mass, and respective second structures which extend from the respective first structures in a direction perpendicular to the out-of-plane sensing axis and face the second side of the out-of-plane sensing mass; and
feedback electrodes, capacitively coupled to the sensing mass and configured to apply opposite electrostatic forces and a torque around the fulcrum axis to the sensing mass, the feedback electrodes include:
a first group of feedback electrodes facing the first side of the out-of-plane sensing mass, the first group of feedback electrodes including a first feedback electrode and a second feedback electrode arranged on the supporting body on opposite sides of the fulcrum axis; and
a second group of feedback electrodes facing the second side of the out-of-plane sensing mass, the second group of feedback electrodes including a third feedback electrode and a fourth feedback electrode on opposite sides of the fulcrum axis, each of the third electrode and the fourth electrode being on a corresponding respective second structure of the feedback supports.