Patent ID: 9174838
Filing Date: 2015-11-03
Classification: B81B,B81C,H01L

Abstract:
1. A method for fabricating a multiple MEMS device comprising: providing a semiconductor substrate having a first MEMS device and a second MEMS device; providing an encapsulation wafer comprising a first cavity, a second cavity, and a vent cavity, wherein the second cavity comprises at least one channel coupled to the vent cavity; providing a first encapsulation environment at a first air pressure; encapsulating the first MEMS device within the first cavity and the second MEMS device within the second cavity, while within the first encapsulation environment, to encapsulate the first MEMS device within the first cavity at the first air pressure; providing a second encapsulating environment at a second air pressure, wherein the second air pressure is different from the first air pressure; subjecting the second MEMS device within the second cavity to the second encapsulation environment via the at least one channel, wherein subjecting the second MEMS device to the second encapsulation environment includes removing a portion of the encapsulation wafer by an etching process or grinding process in order to open the vent cavity and subject the second cavity to the second encapsulation environment through the at least one channel; and sealing the at least one channel, while within the second encapsulation environment, to encapsulate the second MEMS device within the second cavity at the second air pressure.