Patent ID: 8569850

Claim:
A sensor including: a backplate including a plurality of backplate holes; a cavity extending above the plurality of backplate holes; a diaphragm of electrically conductive or semi-conductive material that is connected to, and insulated from the backplate, the diaphragm defining a flexible member and an air gap extending below the plurality of backplate holes and associated with the flexible member; a first bond pad formed on an area of the back plate surrounding the cavity; and a second bond pad formed on an area of the diaphragm surrounding the air gap; wherein the flexible member and air gap defined by the diaphragm extend beneath the plurality of backplate holes, wherein the diaphragm is formed from silicon-on-insulator (SOI) wafer including a layer of heavily doped silicon, a layer of silicon and an intermediate oxide layer, and wherein the backplate is formed from a silicon wafer including an oxide layer on only one side thereof.