Patent ID: 8524519

Claim:
A method for manufacturing a MEMS microphone device, comprising: providing a substrate; forming at least one metal layer, at least one via layer and an insulating material region above the substrate, the at least one metal layer including a top metal layer; forming a mask layer above the top metal layer; removing a portion of the mask layer to expose a portion of the insulating material region; fixing a first lid above the mask layer, the first lid having at least one opening; etching the backside of the substrate to form a first cavity; fixing a second lid under the substrate; and removing a portion of the insulating material region to form a second cavity, wherein the second cavity communicates with the first cavity and the at least one opening, and wherein the second cavity, the at least one metal layer, the at least one via layer, and the insulating material region together form a MEMS device region.