Patent ID: 9467785
Filing Date: 2016-10-11
CPC Classification: H01L,H04R

Claim Text:
1. A microelectromechanical system (MEMS) microphone assembly, comprising a cover having volume, a base, the base being coupled to the cover and together with the cover defining an interior cavity, the base including a top surface facing the interior cavity and a bottom surface extending over substantially all of the base, the bottom surface of the base being exposed to an exterior environment of the microphone; wherein the base comprises a plurality of layers including at least one bottom layer having an exterior surface that forms the bottom surface of the base, and the base having an interior surface disposed in parallel to the exterior surface, the interior surface being at least partially exposed to the interior cavity; wherein the base forms a recess extending from the top surface of the base to the interior surface of the bottom layer of the base, the recess having a horizontal dimension and a shape so as to hold a MEMS die, the MEMS die disposed on the interior surface of the bottom layer of the base and within the recess, the MEMS die including a diaphragm and back plate; and wherein the bottom layer forms a port opening extending from the exterior surface of the bottom layer to the interior surface of the bottom layer, the port opening having a port diameter, the port diameter being less than the horizontal dimension of the recess.