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Zero-Height Silicon Microphone Under the PCB of a Comunication Device

IP.com Disclosure Number: IPCOM000131188D
Publication Date: 2005-Nov-09
Document File: 1 page(s) / 17K

Publishing Venue

The IP.com Prior Art Database

Abstract

Due to the placement of other components it is not possible to locate the microphone as close to the bottom of the device as desired. Proximity to the antenna causes RF noise issues. On the other hand, being too far from the bottom of the device decreases acoustic sensitivity due to the increased distance from the talker's mouth and therefore increases noise levels due to the extra electronic gain required. Acoustic porting too close to the receiver and loudspeaker can cause acoustic stability and echo issues.

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ZERO-HEIGHT SILICON MICROPHONE UNDER PCB

Zero-Height Silicon Microphone Under the PCB of a Comunication Device

Disclosed Anonymously

Due to the placement of other components it is not possible to locate the microphone as close to the bottom of the device as desired.  Proximity to the antenna causes RF noise issues.  On the other hand, being too far from the bottom of the device decreases acoustic sensitivity due to the increased distance from the talker's mouth and therefore increases noise levels due to the extra electronic gain required.  Acoustic porting too close to the receiver and loudspeaker can cause acoustic stability and echo issues.

By placing the microphone reasonably far from the antenna yet reasonably close to the bottom end of the device, it is possible to isolate it from the RF field using an RF shield but still acoustically port it closer to the bottom.  This invention uses less complex RF shielding and acoustic porting.

Zero Height Silicon MIC under PCB