Patent ID: 7763487
Filing Date: 2010-07-27
Classification: G01L

Abstract:
1. A process for manufacturing an integrated differential pressure sensor, comprising: forming a cavity in a monolithic body of semiconductor material having a first face and a second face, the cavity extending into the monolithic body a distance from said first face and terminating in the monolithic body a distance from said second face, the cavity delimited at the first face by a flexible membrane integrally formed with the monolithic body and formed in part by epitaxial growth from the monolithic body and in part by thermal annealing following the epitaxial growth, and forming said cavity comprises: forming an access passage in the monolithic body that is in fluid communication with said cavity, including etching said monolithic body to form an access trench extending through said monolithic body; and forming in said flexible membrane at least one transduction element configured to convert a deformation of said flexible membrane into electrical signals.