Patent ID: 9392361
Filing Date: 2016-07-12
CPC Classification: H03F,H04R

Claim Text:
1. A device comprising: a microphone interface configured to directly couple a microphone, wherein the microphone interface comprises: a DC servo loop configured to provide a DC path for a DC bias current supplied to the microphone; and an AC ground to provide an AC path for an AC output of the microphone, wherein the AC path is separated from the DC path; wherein the DC servo loop comprises: a controlled DC source directly supplying the DC bias current to the microphone; and a servo amplifier having at least one input coupled to the microphone, and an output coupled to the controlled DC source, and operative to control the DC bias current output by the controlled DC source and supplied directly to the microphone, wherein the servo amplifier is adapted to sense the DC bias current required to bias the microphone.