Patent ID: 7781249
Filing Date: 2010-08-24
Classification: B81B,B81C,H04R,Y10S

Abstract:
1. A method of fabricating a micro-electrical-mechanical system (MEMS) microphone on a substrate, the method comprising: depositing first and second electrodes; depositing a membrane, the membrane being mechanically coupled to the first electrode; and depositing a back plate, the back plate being mechanically coupled to the second electrode; wherein the step of depositing the membrane further comprises the step of depositing the membrane on a first sacrificial layer; and wherein the method further comprises the steps of: depositing a second sacrificial layer in an area between the first and second electrodes; and removing the first and second sacrificial layers so as to form a MEMS microphone having a first cavity beneath the membrane, and a second cavity between the first and second electrodes, such that the membrane and the first electrode are able to move relative to the second electrode.