Qualcomm Incorporated

Khalid Junaid Sidiqi

Louis Dominic Oliveira

Mustafa Keskin

Robert P Gilmore

Seyfollah Seyfollahi Bazarjani

Jeffrey Mark Hinrichs

Hui-Ya Liao Nelson

Guoqing Miao

James Ian Jaffee

Joseph Robert Fitzgerald

Derick Hugunin

Uma Chilakapati

In one embodiment, an electronic device includes an audio connector port comprising a ground terminal and one or more audio output terminals, a first audio amplifier coupled to one of the audio output terminals, and a multiplexer having an output terminal coupled to the input terminal of the first audio amplifier. Sense circuits inside the electronic device may be alternately coupled through the multiplexer and first audio amplifier so that, in a first mode of operation, the multiplexer couples the audio signal to the first audio output terminal, and in a second mode of operation, the multiplexer couples an analog voltage corresponding to an internally sensed value to the first audio output terminal. Use of the audio connector and audio circuitry to access internal electrical parameters may facilitate testing and analysis of internal systems.

Audio interface circuits and methods

A nonlinear power supply generator is provided that nonlinearly changes a power supply voltage for a circuit during power up of the circuit to reduce high-frequency noise in an output signal from the circuit.

Nonlinear power supply ramping for pop-click noise reduction

A digital offset is combined with an audio signal in the digital domain to cancel an output offset caused by one or more analog components processing the same audio signal. In this manner, the offset at the output of the audio signal path (e.g., at a power amplifier output) is reduced or eliminated. Consequently, audible artifacts, such as click-and-pop artifacts, can be reduced or eliminated. In audio devices operating in ground-referenced capless mode, power consumption is reduced because of reduced or eliminated direct current (DC) leakage current through speakers or headsets of such audio devices. In some circumstances, the digital offset in the digital domain may be applied at substantially all times of operation of the audio signal path.

Suppressing output offset in an audio device

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San Diego, CA, United States of America

Khalid Junaid Sidiqi