Patent ID: 8569092
Filing Date: 2013-10-29
Classification: B81B,B81C,G01L,G01P

Abstract:
1. A method for fabricating a sensor, comprising the steps of: forming a substrate recess in a semiconductor substrate wafer; forming a device recess in a semiconductor device wafer, wherein said device wafer comprises a first device layer, a second device layer, a first oxide layer, and a second oxide layer, wherein said first oxide layer is located under said first device layer, said second device layer is located under said first oxide layer, and said second oxide layer is located under said second device layer, and wherein said device recess extends through said first device layer to expose said first oxide layer; securing said first device layer to said substrate wafer, wherein said device recess is aligned over said substrate recess; implanting a piezoresistive acceleration sensor at a first location in said second device layer and a piezoresistive pressure sensor in said second device layer at a second location, each of the sensors configured to sense flexure in said second device layer; and selecting a thickness of each of the first device layer, the second device layer, the first oxide layer, and the second oxide layer that corresponds to a predetermined sensitivity factor of each of the acceleration sensor and the pressure sensor.