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

Claim 0:
1. A closed-loop microelectromechanical accelerometer, comprising:
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, wherein 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; 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,
wherein the feedback electrodes include:
a first feedback electrode and a second feedback electrode, through the first and second feedback electrodes are arranged on the supporting body symmetrically with respect to the fulcrum axis and facing the first side of the out-of-plane sensing mass; and
a third feedback electrode and a fourth feedback electrode, the third and fourth feedback electrodes are supported by respective feedback supports symmetrically with respect to the fulcrum axis and facing the second side of the out-of-plane sensing mas,

wherein the respective feedback supports include:
respective first structures anchored to the supporting body and extending in a direction parallel to the out-of-plane sensing axis through openings in the out-of-plane sensing mass; and
respective second structures that 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.