Patent ID: 11906416
Assignee: STMICROELECTRONICS S.R.L.
Field: Measurement (Instruments)
Classification: CPC G  B | IPC B  G

Claim 7:
8. The MEMS sensing device of claim 5, wherein the top conductive layer comprises a first top plate surrounding the central portion of the membrane and a second top plate surrounding the first top plate, the first and second top plates being electrically insulated from each other, and the bottom conductive layer comprises a first bottom plate surrounding the central portion of the membrane and a second bottom plate surrounding the first bottom plate, the first and second bottom plates being electrically insulated from each other,
wherein the second top plate and the second bottom plate are configured to receive the sensing electric signals during the first operative phase,
wherein the first top plate and the first bottom plate are configured to be biased during the first operative phase so that a voltage difference develops across the first top plate and the first bottom plate having a value that causes the membrane to have a concave upwards shape, and
wherein the second top plate and the second bottom plate are configured to be biased during the second operative phase so that a voltage difference develops across the second top plate and the second bottom plate having a value that causes the membrane to have a concave downward shape.