Patent ID: 8516889

Claim:
A MEMS resonant accelerometer, comprising: a substrate; a proof mass; a first anchoring region coupled to the substrate; a first elastic element coupled to the first anchoring region and the proof mass, the first elastic element configured to allow movement along a sensing axis in response to an external acceleration; a second anchoring region coupled to the substrate; a second elastic element coupled to the second anchoring region and to the proof mass, the second elastic element configured to allow movement along the sensing axis in response to the external acceleration; a third anchoring region coupled to the substrate; a first resonating element having a resonant frequency and a longitudinal extension along the sensing axis with a first end and a second end, the first end coupled to the third anchoring region and the second end coupled to a first coupling point on the first elastic element, the first resonating element being coupled to the proof mass via the first elastic element, and configured to generate a first variation of the resonant frequency in response to a first axial stress when the proof mass moves along the sensing axis; a fourth anchoring region coupled to the substrate; and a second resonating element having the resonant frequency and a longitudinal extension along the sensing axis with a respective first end and a respective second end, the respective first end coupled to the fourth anchoring region and the respective second end coupled to a second coupling point on the second elastic element, the second resonating element being coupled to the proof mass via the second elastic element, and being configured to generate a second variation of the resonant frequency in response to a second axial stress when the proof mass moves along the sensing axis, the second axial stress being substantially opposite to the first axial stress, and the second variation being substantially opposite to the first variation.