Patent ID: 8188557
Filing Date: 2012-05-29
Classification: H04R

Abstract:
1. An acoustic micro-electrical-mechanical-system (MEMS) transducer formed on a single die based on a semiconductor material and having front and back surface parts opposed to each other, said acoustic MEMS transducer comprising: a cavity formed in the die to thereby provide a back volume with an upper portion facing an opening of the cavity and a lower portion facing a bottom of the cavity, and a back plate and a diaphragm arranged substantially in parallel, with an air gap there between and extending at least partly across the opening of the cavity, said back plate and diaphragm being integrally formed with the front surface part of the die, wherein the bottom of the cavity is bounded by the die; wherein backside openings are formed in the die with said openings extending from the back surface part of the die to the cavity bottom.