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    PROTECTION OF A SPEAKER FROM THERMAL DAMAGE
    11.
    发明申请
    PROTECTION OF A SPEAKER FROM THERMAL DAMAGE 有权

    公开(公告)号：US20170085986A1

    公开(公告)日：2017-03-23

    申请号：US14858306

    申请日：2015-09-18

    Applicant: Qualcomm Incorporated

    Inventor： Zhilong Tang ,  Jingxue Lu

    IPC: H04R3/00 ,  H04R29/00

    CPC classification number: H04R3/007 ,  H04R29/001 ,  H04R2203/00 ,  H04R2430/01

    Abstract: A method of protecting a speaker from thermal damage includes determining a first load current through a first resistor that is coupled to the speaker. The method also includes converting the first load current to a digital value using a second load current through a second resistor as a reference input. The second resistor is part of a circuit that reduces an effect of a temperature coefficient of resistance of the first resistor. The method also includes comparing the digital value of the first load current to a threshold value. The method further includes, responsive to the first load current being larger than the threshold value, generating an instruction to take an action to protect the speaker.

    POWER SUPPLY REJECTION RATE THROUGH NOISE CANCELLATION IN AN AUDIO AMPLIFIER LOOP
    12.
    发明申请
    POWER SUPPLY REJECTION RATE THROUGH NOISE CANCELLATION IN AN AUDIO AMPLIFIER LOOP 有权
    在音频放大器环路中通过噪声消除的电源抑制率

    公开(公告)号：US20160294337A1

    公开(公告)日：2016-10-06

    申请号：US14673613

    申请日：2015-03-30

    Applicant: QUALCOMM Incorporated

    Inventor： Jingxue Lu

    IPC: H03F3/183 ,  H03F3/217 ,  H03F1/02

    CPC classification number: H03F3/183 ,  H03F1/0211 ,  H03F1/30 ,  H03F3/187 ,  H03F3/217 ,  H03F3/2171 ,  H03F3/2173 ,  H03F2200/03 ,  H03F2200/351 ,  H04B15/005

    Abstract: Embodiments contained in the disclosure provide a method of cancelling power supply noise that affects the output of a class-D audio amplifier. The method begins when an alternating current (AC) coupled signal is input into an inverting amplifier. That signal is then amplified in the inverting amplifier. The amplified AC coupled signal is then feed through a resistor capacitor (RC) network, and from the RC network to an inverting input of the inverting amplifier. The output of a high pass filter is used to cancel the power supply ripple signal as the output of the high pass filter is injected into a supply voltage line. The cancelling signal is opposite in magnitude to the power supply ripple signal. The apparatus includes an inverting amplifier, a capacitor for coupling to an AC signal, and a resistor, in combination with the capacitor.

    Abstract translation: 包含在本公开内容中的实施例提供了一种消除影响D类音频放大器的输出的电源噪声的方法。 当将交流（AC）耦合信号输入到反相放大器时，该方法开始。 然后在反相放大器中放大该信号。 放大的交流耦合信号然后通过电阻电容（RC）网络，从RC网络馈送到反相放大器的反相输入端。 当高通滤波器的输出被注入电源电压线时，高通滤波器的输出用于消除电源纹波信号。 消除信号与电源纹波信号的幅度相反。 该装置包括反相放大器，用于耦合到AC信号的电容器和与电容器组合的电阻器。

    Voltage-to-current architecture and error correction schemes
    14.
    发明授权
    Voltage-to-current architecture and error correction schemes 有权

    公开(公告)号：US11536749B2

    公开(公告)日：2022-12-27

    申请号：US17154758

    申请日：2021-01-21

    Applicant: QUALCOMM Incorporated

    Inventor： Ramkumar Sivakumar ,  Jingxue Lu ,  Sherif Galal ,  Xinwang Zhang ,  Kshitij Yadav

    IPC: H03F3/20 ,  H03F1/00 ,  H04R3/00 ,  G01R19/00 ,  H03F3/217 ,  H03F1/02

    Abstract: Certain aspects of the present disclosure are generally directed to circuitry and techniques for voltage-to-current conversion. For example, certain aspects provide a circuit for signal amplification including a first amplifier; a first transistor, a gate of the first transistor being coupled to an output of the first amplifier and a drain of the first transistor being coupled to an output node of circuit; a first resistive element coupled between a first input node of the circuit and an input of the first amplifier; a second amplifier; a second transistor, a gate of the second transistor being coupled to an output of the second amplifier and a drain of the second transistor being coupled to the output node of circuit; and a second resistive element coupled between a second input node of the circuit and an input of the second amplifier.

    Delay-free poly-phase quantizer and quantization method for PWM mismatch shaping
    15.
    发明授权
    Delay-free poly-phase quantizer and quantization method for PWM mismatch shaping 有权

    公开(公告)号：US10164650B2

    公开(公告)日：2018-12-25

    申请号：US15435155

    申请日：2017-02-16

    Applicant: QUALCOMM Incorporated

    Inventor： Jingxue Lu ,  Matthew Sienko

    IPC: H03M1/06 ,  H03M3/00

    Abstract: A system and method for pulse-width modulation (PWM) mismatch shaping. The method includes receiving a multi-bit pulse-code modulated (PCM) signal and generating a voltage ramp signal. The method includes generating a first corrected signal based on a first feedback signal and the multi-bit PCM signal. The method includes generating a first single-bit PWM signal based on the first corrected signal and the voltage ramp signal. The method includes delaying the voltage-ramp signal and generating a second corrected signal based on a second feedback signal and the multi-bit PCM signal. The method includes generating a second single-bit PWM signal based on the second corrected signal and the delayed voltage ramp signal and generating a multi-bit pulse-density modulation (PDM) signal based on the first single-bit PWM signal and the second single-bit PWM signal.

    Swing limiter circuit
    17.
    发明授权
    Swing limiter circuit 有权
    摆动限位器电路

    公开(公告)号：US09425755B1

    公开(公告)日：2016-08-23

    申请号：US14812054

    申请日：2015-07-29

    Applicant: QUALCOMM Incorporated

    Inventor： Jingxue Lu ,  Chenling Huang

    IPC: H05K1/18 ,  H03F3/45 ,  H03F3/217

    CPC classification number: H03F3/45668 ,  H03F3/2171 ,  H03F3/24 ,  H03F3/245 ,  H03F3/45497 ,  H03F2203/45151 ,  H03F2203/45522 ,  H03F2203/45526 ,  H04B2001/0408

    Abstract: A differential class-D amplifier module having common-mode swing limiter circuit is disclosed. The differential class-D amplifier module may include differential class-D amplifier configured to generate differential pulse width modulated (PWM) output signals based on differential input signals and at least a portion of the differential PWM output signals that are fed back to the differential class-D amplifier. The common-mode swing limiter circuit may attenuate one or more common-mode signal components associated with the PWM output signals that may be fed back to input terminals of the differential class-D amplifier.

    Abstract translation: 公开了具有共模摆幅限幅器电路的差分D类放大器模块。 差分D类放大器模块可以包括差分D类放大器，其被配置为基于差分输入信号产生差分脉冲宽度调制（PWM）输出信号，以及反馈到差分类的至少一部分差分PWM输出信号 -D放大器。 共模摆幅限制器电路可以衰减与可以反馈到差分D类放大器的输入端的PWM输出信号相关联的一个或多个共模信号分量。

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