Patent ID: 7666698
Filing Date: 2010-02-23
Classification: B81C

Abstract:
1. A method for constructing a microelectronic assembly comprising: providing a substrate having a micro-electromechanical system (MEMS) device formed on a first portion thereof, a semiconductor device formed on a second portion thereof, and a build up layer formed over the MEMS device and the semiconductor device and comprising a plurality of insulating layers and conductors, the conductors electrically connecting at least one of the MEMS device and the semiconductor device to an upper portion of the build up layer; removing a first portion of the build up layer over the MEMS device; forming a release body over the MEMS device after the removing of the first portion of the build up layer; forming an etch stop layer at least partially over the MEMS device and the build up layer after the forming of the release body; forming a structural material over the release body after the forming of the etch stop layer; forming an opening in the structural material to expose the release body; removing the release body through the opening to form a cavity between the MEMS device and the structural material; and sealing the opening in the structural material with a sealing material.