Patent ID: 9187317
Filing Date: 2015-11-17
Classification: B81B,B81C

Abstract:
1. A method for forming a micro-electromechanical (MEMS) device comprising: providing a MEMS wafer, wherein a portion of the MEMS wafer is patterned to provide a first membrane for a microphone device and a second membrane for a pressure sensor device; bonding a carrier wafer to the MEMS wafer; etching the carrier wafer and the MEMS wafer to expose both surfaces of the first membrane for the microphone device to an ambient environment; patterning a MEMS substrate and removing portions of a first sacrificial layer of the MEMS wafer to form a MEMS structure; bonding a cap wafer to a side of the MEMS wafer opposing the carrier wafer to form a first sealed cavity including the MEMS structure; and forming a second sealed cavity and a cavity exposed to an ambient environment on opposing sides of the second membrane for the pressure sensor device.