Patent ID: 9506827
Filing Date: 2016-11-29
CPC Classification: G01L

Claim Text:
1. A pressure sensor assembly comprising: a first silicon wafer with a top and a bottom; a cavity formed in the silicon wafer, the cavity extending from the bottom of the first silicon wafer up towards the top of the first silicon wafer to form a cavity bottom such that a diaphragm is formed between the cavity bottom and the top of the first silicon wafer; an electrical circuit formed by a conductive layer deposited on the top of the first silicon wafer; a second silicon wafer coupled along the bottom of the first silicon wafer and covering the cavity to form a chamber; a dielectric layer that electrically isolates an interior of the chamber from the first silicon wafer; a plurality of ports located on a top of the second silicon wafer within an area defined by the cavity, the plurality of ports extending through the second silicon wafer to a bottom of the second silicon wafer; a third silicon wafer coupled to the top of the first silicon wafer such that the third silicon wafer covers the diaphragm; and, a second cavity cut into a bottom of the third silicon wafer wherein the second cavity is sized and positioned such that the second cavity surrounds the diaphragm.