Patent ID: 9237402
Filing Date: 2016-01-12
CPC Classification: H04R

Claim Text:
1. A CMOS MEMS capacitive microphone die comprising: a diaphragm comprising two metallic layers, each of the metallic layers being parallel to and substantially aligned vertically with the other, having an intermetal layer between the two metallic layers, and having a plurality of vias between the two metallic layers; a support structure comprising a plurality of metallic layers, each of the metallic layers being parallel to and substantially aligned vertically with the others, having a plurality of intermetal layers between the plurality of metallic layers, having a first plurality of vias between the metallic layers, and having an open center portion running from the top to the bottom of the support structure; a spring comprising two metallic layers, each of the metallic layers being parallel to and substantially aligned vertically with the other, having an intermetal layer between the two metallic layers, and having a plurality of vias between the two metallic layers; a back plate comprising two metallic layers, each of the metallic layers being parallel to and substantially aligned vertically with the other, having an intermetal layer between the two metallic layers, and having a plurality of vias between the two metallic layers; where: