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公开(公告)号：US09699542B2
公开(公告)日：2017-07-04
申请号：US14506062
申请日：2014-10-03
Applicant: Analog Devices Global
Inventor： Ulrik Sørensen Wismar , Sejun Kim
CPC classification number: H04R1/1041 , H03F3/187 , H03F3/45475 , H03F2200/03 , H03F2200/189 , H03F2203/45541 , H03F2203/45544 , H03F2203/45586 , H03F2203/45588 , H03F2203/45622 , H04R5/033 , H04R5/04 , H04R29/001
Abstract: A headset driver circuit is described which comprises a connector interface. The connector interface comprises a first terminal, a second terminal and a third terminal for establishing respective electrical connections to a first speaker, a microphone and a common ground node of a headphone, earphone or headset, respectively. A first power amplifier is coupled to the first terminal to supply a first audio output signal to the first speaker of the headset. A first switch arrangement comprises a first ground switch is configured for selectively connecting and disconnecting the second terminal and a ground node of the headset driver circuit. The headset driver circuit further comprises a second ground switch configured for selectively connecting and disconnecting the third terminal and the ground node. The headset driver circuit also comprises a differential preamplifier, e.g. a microphone preamplifier, configured to generate a microphone output voltage where the differential preamplifier comprises a first signal input coupled to the second terminal and a second signal input coupled to the third terminal of the connector interface. An error suppression circuit is configured to sense or sample a noise or error voltage at the second terminal when ground connected or the third terminal when ground connected. The error suppression circuit is further configured to add the sensed or sampled noise or error voltage to a predetermined DC bias voltage and generate an error compensated DC bias voltage for the ungrounded one of the second and third terminals of the connector interface.
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