Charge-pump power supply with voltage-headroom-dependent supply voltage

    公开(公告)号:US09634621B1

    公开(公告)日:2017-04-25

    申请号:US14035654

    申请日:2013-09-24

    Abstract: 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
    5.
    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

    CPC classification number: H03G3/007

    Abstract: 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.

    Abstract translation: 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。

    Enhancement of dynamic range of audio signal path
    6.
    发明授权
    Enhancement of dynamic range of audio signal path 有权
    增强音频信号路径的动态范围

    公开(公告)号:US09391576B1

    公开(公告)日:2016-07-12

    申请号:US14083972

    申请日:2013-11-19

    Abstract: In accordance with embodiments of the present disclosure, an apparatus for providing an output signal to an audio transducer may include an analog signal path portion, a digital-to-analog converter (DAC), and a control circuit. The analog signal path portion may have an audio input for receiving an analog input signal, an audio output for providing the output signal, and a selectable analog attenuation, and may be configured to generate the output signal based on the analog input signal and in conformity with the selectable analog attenuation. The DAC may have a selectable digital gain and may be configured to convert a digital audio input signal into the analog input signal in conformity with the selectable digital gain. The control circuit may be configured to select the selectable analog attenuation and select the selectable digital gain based on a magnitude of a signal indicative of the output signal.

    Abstract translation: 根据本公开的实施例,用于向音频换能器提供输出信号的装置可以包括模拟信号路径部分,数模转换器(DAC)和控制电路。 模拟信号路径部分可以具有用于接收模拟输入信号的音频输入,用于提供输出信号的音频输出和可选择的模拟衰减,并且可以被配置为基于模拟输入信号生成输出信号 具有可选择的模拟衰减。 DAC可以具有可选择的数字增益,并且可以被配置为根据可选择的数字增益将数字音频输入信号转换成模拟输入信号。 控制电路可以被配置为基于指示输出信号的信号的大小来选择可选择的模拟衰减并选择可选数字增益。

    Opportunistic playback state changes for audio devices

    公开(公告)号:US09831843B1

    公开(公告)日:2017-11-28

    申请号:US14204793

    申请日:2014-03-11

    Abstract: 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.

    Reducing kickback current to power supply during charge pump mode transitions
    8.
    发明授权
    Reducing kickback current to power supply during charge pump mode transitions 有权
    在电荷泵模式转换期间将反冲电流降低到电源

    公开(公告)号:US09293986B2

    公开(公告)日:2016-03-22

    申请号:US14108101

    申请日:2013-12-16

    Abstract: Kickback current from a charge pump to a power management integrated circuit (PMIC) may be reduced by dissipating charge from fly and hold capacitors during mode transitions. A switch may be placed in series between the charge pump and the PMIC to disconnect the charge pump and prevent kickback current from reaching the PMIC. Further, additional loads, as switches, may be coupled to the charge pump outputs to dissipate charge from the fly and hold capacitors. Additionally, a closed feedback loop may be used to monitor and discharge excess charge from the fly and hold capacitors during mode transitions. Furthermore, charge may be redistributed between the fly and hold capacitors during mode transitions to reduce the time period of the transition.

    Abstract translation: 可以通过在模式转换期间通过耗散来自飞行和保持电容器的电荷来减少从电荷泵到功率管理集成电路(PMIC)的启动电流。 开关可以串联放置在电荷泵和PMIC之间以断开电荷泵,并防止反冲电流到达PMIC。 此外,作为开关的附加负载可以耦合到电荷泵输出以从飞行和保持电容器消散电荷。 另外,在模式转换期间,可以使用闭合反馈回路来监测和排出来自飞行和保持电容器的过量电荷。 此外,在模式转换期间,可以在飞行和保持电容器之间重新分配电荷以减少转换的时间段。

    REDUCING KICKBACK CURRENT TO POWER SUPPLY DURING CHARGE PUMP MODE TRANSITIONS
    10.
    发明申请
    REDUCING KICKBACK CURRENT TO POWER SUPPLY DURING CHARGE PUMP MODE TRANSITIONS 有权
    在充电泵模式转换期间减少电源电流

    公开(公告)号:US20140340158A1

    公开(公告)日:2014-11-20

    申请号:US14108101

    申请日:2013-12-16

    Abstract: Kickback current from a charge pump to a power management integrated circuit (PMIC) may be reduced by dissipating charge from fly and hold capacitors during mode transitions. A switch may be placed in series between the charge pump and the PMIC to disconnect the charge pump and prevent kickback current from reaching the PMIC. Further, additional loads, as switches, may be coupled to the charge pump outputs to dissipate charge from the fly and hold capacitors. Additionally, a closed feedback loop may be used to monitor and discharge excess charge from the fly and hold capacitors during mode transitions. Furthermore, charge may be redistributed between the fly and hold capacitors during mode transitions to reduce the time period of the transition.

    Abstract translation: 可以通过在模式转换期间通过耗散来自飞行和保持电容器的电荷来减少从电荷泵到功率管理集成电路(PMIC)的启动电流。 开关可以串联放置在电荷泵和PMIC之间以断开电荷泵,并防止反冲电流到达PMIC。 此外,作为开关的附加负载可以耦合到电荷泵输出以从飞行和保持电容器消散电荷。 另外,在模式转换期间,可以使用闭合反馈回路来监测和排出来自飞行和保持电容器的过量电荷。 此外,在模式转换期间,可以在飞行和保持电容器之间重新分配电荷以减少转换的时间段。

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