公开(公告)号：US09438982B2

公开(公告)日：2016-09-06

申请号：US14031287

申请日：2013-09-19

申请人： Cirrus Logic, Inc.

发明人： Bharath Kumar Thandri ,  Vivek Jindal

IPC分类号： H04R1/10 ,  H04R5/04

CPC分类号： H04R1/1041 ,  H04R5/04 ,  H04R2420/05

摘要： In accordance with systems and methods of the present disclosure, an audio device may include an electrical terminal, an audio circuit, and a transducer load detection circuit. The electrical terminal may couple a transducer device to the audio device. The audio circuit may generate an analog audio signal, wherein the analog audio signal is coupled to the electrical terminal. The transducer load detection circuit may detect a load impedance of the transducer device when the transducer device is coupled to the audio device from characteristics measured at the electrical terminal.

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.

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。

公开(公告)号：US09620101B1

公开(公告)日：2017-04-11

申请号：US14048485

申请日：2013-10-08

申请人： Cirrus Logic, Inc.

发明人： Bharath Kumar Thandri ,  Aniruddha Satoskar ,  Jeffrey D. Alderson ,  John L. Melanson

IPC分类号： G10K11/16

CPC分类号： G10K11/178 ,  G10K11/1785 ,  G10K2210/3212 ,  H02M3/07 ,  H03F1/0222 ,  H03F1/26 ,  H03F3/187 ,  H03F3/72 ,  H03F2200/507

摘要： An audio amplifier circuit may include a power amplifier, a charge pump power supply, and a control circuit. The power amplifier may have an audio input for receiving an audio input signal, an audio output for providing the output signal, and a power supply input. The charge pump power supply may provide a power supply voltage to the power supply input. The charge pump power supply may have a select input for selecting an operating mode of the power supply. In a first operating mode, the power supply voltage may equal to a first voltage, and in a second operating mode, the power supply voltage may be substantially equal to a second voltage which is a rational fraction of the first voltage. The control circuit may generate the select input based on a magnitude of anti-noise generated by an adaptive noise cancellation system associated with the audio transducer.

公开(公告)号：US20160056777A1

公开(公告)日：2016-02-25

申请号：US14929974

申请日：2015-11-02

申请人： Cirrus Logic, Inc.

发明人： Bharath Kumar Thandri ,  John L. Melanson

IPC分类号： H03F3/183 ,  H03F3/217 ,  H02M3/07 ,  H03F1/02

CPC分类号： H03F3/183 ,  H02M3/07 ,  H02M2003/071 ,  H02M2003/072 ,  H03F1/0211 ,  H03F1/0227 ,  H03F3/185 ,  H03F3/217 ,  H03F2200/03 ,  H03F2200/102

摘要： A charge pump power supply may comprise a plurality of capacitors and a switching circuit for switching the capacitors to provide a first voltage or a second voltage in accordance with the select input. The charge pump power supply may have a signal polarity input for indicating a polarity of an output audio signal. Switches for switching one or more capacitors providing a first polarity voltage in a then-current operating mode may be configured to switch at a greater frequency than switches for switching one or more capacitors providing a second polarity voltage responsive to the signal polarity input indicating a positive polarity of the output audio signal. Switches for switching one or more capacitors providing the first polarity voltage in a then-current operating mode are configured to switch at a lesser frequency than switches for switching one or more capacitors providing the second polarity voltage responsive to the signal polarity input indicating a negative polarity of the output audio signal.

摘要翻译： 电荷泵电源可以包括多个电容器和用于切换电容器以根据选择输入提供第一电压或第二电压的开关电路。 电荷泵电源可以具有用于指示输出音频信号的极性的信号极性输入。 用于切换在当前操作模式中提供第一极性电压的一个或多个电容器的开关可以被配置为以比用于切换提供第二极性电压的一个或多个电容器的开关更大的频率切换，所述电容器响应于指示正的 输出音频信号的极性。 用于切换在当前操作模式中提供第一极性电压的一个或多个电容器的开关被配置为响应于指示负极性的信号极性输入而以比用于切换提供第二极性电压的一个或多个电容器的开关更小的频率 的输出音频信号。

公开(公告)号：US20150078558A1

公开(公告)日：2015-03-19

申请号：US14031287

申请日：2013-09-19

申请人： Cirrus Logic, Inc.

发明人： Bharath Kumar Thandri ,  Vivek Jindal

IPC分类号： H04R29/00

CPC分类号： H04R1/1041 ,  H04R5/04 ,  H04R2420/05

摘要： In accordance with systems and methods of the present disclosure, an audio device may include an electrical terminal, an audio circuit, and a transducer load detection circuit. The electrical terminal may couple a transducer device to the audio device. The audio circuit may generate an analog audio signal, wherein the analog audio signal is coupled to the electrical terminal. The transducer load detection circuit may detect a load impedance of the transducer device when the transducer device is coupled to the audio device from characteristics measured at the electrical terminal.

摘要翻译： 根据本公开的系统和方法，音频设备可以包括电气终端，音频电路和换能器负载检测电路。 电气终端可将传感器装置耦合到音频装置。 音频电路可以产生模拟音频信号，其中模拟音频信号耦合到电气终端。 换能器负载检测电路可以根据在电气端子处测量的特性将传感器装置耦合到音频装置时，检测换能器装置的负载阻抗。

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.

公开(公告)号：US09293986B2

公开(公告)日：2016-03-22

申请号：US14108101

申请日：2013-12-16

申请人： Cirrus Logic, Inc.

发明人： Bharath Kumar Thandri ,  Thuan L. Nguyen ,  Daniel John Allen ,  Lingli Zhang ,  Aniruddha Satoskar ,  Aaron Brennan ,  Dan Shen

IPC分类号： H03F1/30 ,  H02M3/07 ,  H03F1/02

CPC分类号： H02M3/07 ,  H03F1/025 ,  H03F3/005 ,  H03F3/187 ,  H03F2200/03 ,  H03F2200/555 ,  H03F2200/78

摘要： 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.

摘要翻译： 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。

公开(公告)号：US09209757B1

公开(公告)日：2015-12-08

申请号：US14067485

申请日：2013-10-30

申请人： Cirrus Logic, Inc.

发明人： Bharath Kumar Thandri ,  John L. Melanson

IPC分类号： H03F99/00 ,  H03F3/181

CPC分类号： H03F3/183 ,  H02M3/07 ,  H02M2003/071 ,  H02M2003/072 ,  H03F1/0211 ,  H03F1/0227 ,  H03F3/185 ,  H03F3/217 ,  H03F2200/03 ,  H03F2200/102

摘要： A charge pump power supply may comprise a plurality of capacitors and a switching circuit for switching the capacitors to provide a first voltage or a second voltage in accordance with the select input. The charge pump power supply may have a signal polarity input for indicating a polarity of an output audio signal. Switches for switching one or more capacitors providing a first polarity voltage in a then-current operating mode may be configured to switch at a greater frequency than switches for switching one or more capacitors providing a second polarity voltage responsive to the signal polarity input indicating a positive polarity of the output audio signal. Switches for switching one or more capacitors providing the first polarity voltage in a then-current operating mode are configured to switch at a lesser frequency than switches for switching one or more capacitors providing the second polarity voltage responsive to the signal polarity input indicating a negative polarity of the output audio signal.

摘要翻译： 电荷泵电源可以包括多个电容器和用于切换电容器以根据选择输入提供第一电压或第二电压的开关电路。 电荷泵电源可以具有用于指示输出音频信号的极性的信号极性输入。 用于切换在当前操作模式中提供第一极性电压的一个或多个电容器的开关可以被配置为以比用于切换提供第二极性电压的一个或多个电容器的开关更大的频率切换，所述电容器响应于指示正的 输出音频信号的极性。 用于切换在当前操作模式中提供第一极性电压的一个或多个电容器的开关被配置为响应于指示负极性的信号极性输入而以比用于切换提供第二极性电压的一个或多个电容器的开关更小的频率 的输出音频信号。

公开(公告)号：US20140340158A1

公开(公告)日：2014-11-20

申请号：US14108101

申请日：2013-12-16

申请人： Cirrus Logic, Inc.

发明人： Bharath Kumar Thandri ,  Thuan L. Nguyen ,  Daniel John Allen ,  Lingli Zhang ,  Aniruddha Satoskar ,  Aaron Brennan ,  Dan Shen

IPC分类号： H02M3/07 ,  H03F1/02

CPC分类号： H02M3/07 ,  H03F1/025 ,  H03F3/005 ,  H03F3/187 ,  H03F2200/03 ,  H03F2200/555 ,  H03F2200/78

摘要： 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.

摘要翻译： 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。