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    Charge-pump power supply with voltage-headroom-dependent supply voltage
    1.
    发明授权
    Charge-pump power supply with voltage-headroom-dependent supply voltage 有权

    公开(公告)号：US09634621B1

    公开(公告)日：2017-04-25

    申请号：US14035654

    申请日：2013-09-24

    申请人： Cirrus Logic, Inc.

    发明人： Anand Ilango ,  Aniruddha Satoskar ,  Daniel John Allen ,  Bharath Kumar Thandri

    IPC分类号： H03F3/20

    CPC分类号： H03F1/0227 ,  H02M3/07 ,  H02M2001/0032 ,  H03F1/025 ,  H03F3/3022 ,  H03F3/505 ,  H03F2200/03 ,  H03F2200/211 ,  H03F2200/507 ,  Y02B70/16

    摘要： A method may include providing a power supply voltage to a power supply input of a power amplifier by a charge pump power supply having a select input for selecting an operating mode of the charge pump power supply, such that in a first operating mode, the power supply voltage is equal to a first voltage, and such that in a second operating mode the power supply voltage is equal to a fraction of the first voltage; wherein the power amplifier has an audio input for receiving an audio input signal, and an audio output for providing the output signal, and generates the output signal based on the audio input signal. The method may also include selecting an operating mode of the charge pump power supply based on a magnitude of the power supply voltage and a magnitude of the output signal, such that the charge pump power supply operated in the operating mode having the lowest power supply voltage in which a difference between a magnitude of the power supply voltage and a magnitude of the output signal is more than the predetermined threshold voltage.

    Systems and methods for supply-based gain control of an audio output signal
    2.
    发明授权
    Systems and methods for supply-based gain control of an audio output signal 有权
    用于音频输出信号的基于电源的增益控制的系统和方法

    公开(公告)号：US09584082B1

    公开(公告)日：2017-02-28

    申请号：US14028769

    申请日：2013-09-17

    申请人： Cirrus Logic, Inc.

    发明人： Anand Ilango ,  Aniruddha Satoskar ,  Bharath Kumar Thandri

    IPC分类号： H03G3/00

    CPC分类号： H03G3/007

    摘要： An audio device may include an electrical terminal for coupling a transducer device to the audio device and an audio circuit for generating an analog audio signal coupled to the electrical terminal. The audio circuit may include a pre-amplifier stage, an amplifier, and a gain selector. The pre-amplifier stage may apply a selectable gain to an audio input signal to generate a pre-amplified analog audio signal, wherein the pre-amplifier stage is powered by a first power supply. The amplifier may amplify the pre-amplified analog audio signal to generate the analog audio signal, wherein the amplifier is powered from a second power supply isolated from the first power supply. The gain selector may select the selectable gain based on a level of the first power supply, such that a difference between the second power supply and the analog audio signal is more than a predetermined headroom threshold voltage.

    摘要翻译： 音频设备可以包括用于将换能器设备耦合到音频设备的电气终端和用于产生耦合到电气终端的模拟音频信号的音频电路。 音频电路可以包括前置放大器级，放大器和增益选择器。 预放大器级可以向音频输入信号施加可选择的增益以产生预放大的模拟音频信号，其中前置放大器级由第一电源供电。 放大器可以放大预放大的模拟音频信号以产生模拟音频信号，其中放大器由与第一电源隔离的第二电源供电。 增益选择器可以基于第一电源的电平来选择可选择的增益，使得第二电源和模拟音频信号之间的差大于预定的净空阈值电压。

    Opportunistic playback state changes for audio devices
    4.
    发明授权
    Opportunistic playback state changes for audio devices 有权

    公开(公告)号：US09831843B1

    公开(公告)日：2017-11-28

    申请号：US14204793

    申请日：2014-03-11

    申请人： Cirrus Logic, Inc.

    发明人： Tejasvi Das ,  Bharath Kumar Thandri ,  Anand Ilango ,  Aniruddha Satoskar ,  Daniel John Allen ,  Xiaofan Fei

    IPC分类号： H04R5/00 ,  H03G3/20

    CPC分类号： H03G3/20 ,  H03G3/001 ,  H03G3/002 ,  H03G3/02 ,  H03G3/3005 ,  H03G3/3026 ,  H03M1/66 ,  H03M1/70

    摘要： An audio playback path of an audio apparatus includes a digital modulator, a digital-to-analog converter (DAC), and a power amplifier. The digital modulator receives a playback signal corresponding to playback audio content and generates a digital input signal in accordance with the playback signal. The DAC receives the audio input signal and generates an analog preamplifier signal. The power amplifier generates an audio output signal in accordance with the preamplifier signal and an analog attenuation determined by the analog attenuation signal. The apparatus may include a volume control input to receive a volume control signal and a playback controller configured to perform operations including generating an analog attenuation signal in accordance with the volume control signal, monitoring a playback state indicated by the playback parameters, and responsive to detecting the playback state satisfying the playback criterion, modifying a selected playback parameter to improve a performance parameter of the playback path.