Patent ID: 9212054
Filing Date: 2015-12-15
Classification: B81B,B81C,G01L

Abstract:
1. A method for manufacturing a pressure sensor assembly comprising: forming a sensor from a first silicon wafer by creating a cavity that extends up into the first silicon wafer from a bottom; forming a conductive layer over the top of the first silicon wafer; forming a support from a second silicon wafer by creating a plurality of channels that pass through the second silicon wafer from a top surface to a bottom surface; bonding the bottom of the first silicon wafer to the top surface of the second silicon wafer such that a chamber is formed by the cavity and the plurality of channels open into the chamber; forming a dielectric layer that electrically isolates the chamber from the sensor; forming a cover from a third silicon wafer by creating a second cavity that extends up into the third silicon wafer from a bottom; and bonding the bottom of the third silicon wafer to a top of the first silicon wafer such that the second cavity surrounds the diaphragm.