Patent ID: 6912759
Filing Date: 2005-07-05
Classification: G01L,Y10T

Abstract:
1. A method for forming a sensor comprising the steps of: providing a base wafer; forming a sensor cavity in said base wafer; after said forming step, coupling a diaphragm wafer to said base wafer, said diaphragm wafer including a diaphragm portion, a sacrificial portion, and an insulating layer disposed between said diaphragm portion and said sacrificial portion, and wherein said diaphragm wafer is coupled to said base wafer such said diaphragm portion generally covers said sensor cavity; reducing a thickness of said diaphragm wafer by removing at least part of said sacrificial portion while using said insulating layer as an etch stop; and forming or locating at least one piezo resistive portion on said diaphragm portion.