Patent ID: 8865500
Filing Date: 2014-10-21
Classification: H01L

Abstract:
1. A method of fabricating a MEMS microphone, comprising: providing a substrate comprising a first surface and a second surface, the substrate having at least a logic region and at least a MEMS region; etching the first surface of the substrate to form a plurality of first trenches within the MEMS region; before forming the first trenches, etching the first surface of the substrate to form at least one third trench in the logic region, wherein the step of forming the first trench and the third trench comprises: forming an insulating material in each of the first trenches; etching the second surface of the substrate to form a second trench in the MEMS region by taking the insulating material in the first trenches as an etching stop layer, wherein the second trench communicates with each of the first trenches; and removing the insulating material in each of the first trenches.