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公开(公告)号：US10110175B1
公开(公告)日：2018-10-23
申请号：US15599771
申请日：2017-05-19
Applicant: QUALCOMM Incorporated
Inventor： Khaled Abdelfattah , Sherif Galal
Abstract: Various aspects of this disclosure describe reducing distortion of a power amplifier by coupling a common mode signal, such as determined from a voltage supply signal of the power amplifier or output of the power amplifier, to an input of the power amplifier. A resistive digital-to-analog converter (DAC) can be coupled to the power amplifier, and a common mode signal is modulated onto differential reference voltages of the DAC, causing the common mode signal to exist at both the input and output of the power amplifier at approximately the same time. Consequently, current flowing at differential inputs of the power amplifier due to the common mode component drops to zero, causing distortions due to common mode to differential mode conversion to be reduced.
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公开(公告)号：US12107552B2
公开(公告)日：2024-10-01
申请号：US17448244
申请日：2021-09-21
Applicant: QUALCOMM Incorporated
Inventor： Earl Schreyer , Sherif Galal , Sang-Uk Ryu , Hui-ya Liao Nelson , Subbarao Surendra Chakkirala , Shreyas Srikanth Payal
CPC classification number: H03F1/0227 , H03F3/245 , H03F2200/03 , H03F2200/462 , H03F2200/468
Abstract: A method includes receiving first data associated with a first power amplifier and second data associated with a second power amplifier. The method also includes generating a first amplitude limiting signal having gain parameters that are based on the first data and the second data. The first data includes at least one of a temperature measurement associated with the first power amplifier, a supply voltage measurement associated with the first power amplifier, a load resistance associated with the first power amplifier, or a gain associated with the first power amplifier. The method further includes modifying an audio signal based at least in part on the first amplitude limiting signal to generate a first gain-adjusted audio signal. The method also includes providing a first output audio signal to the first power amplifier for amplification. The first output audio signal is based at least in part on the first gain-adjusted audio signal.
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Patent Agency Ranking
公开(公告)号：US12028030B2
公开(公告)日：2024-07-02
申请号：US17648958
申请日：2022-01-26
Applicant: QUALCOMM Incorporated
Inventor： Dongyang Tang , Xinwang Zhang , ChienChung Yang , Earl Schreyer , Sherif Galal
CPC classification number: H03F3/217 , H03F2200/03
Abstract: Aspects of the present disclosure relate to apparatus and methods for dynamically adjusting the common-mode input signal of a power amplifier, such as a class-D power amplifier. One example power amplifier circuit generally includes a first amplifier having a signal input and a power input; and a common-mode adjustment circuit having a first input coupled to the power input of the first amplifier, having an output coupled to the signal input of the first amplifier, and being configured to generate a common-mode signal to apply to the signal input of the first amplifier, based on a power supply voltage on the power input of the first amplifier.
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公开(公告)号：US11876493B2
公开(公告)日：2024-01-16
申请号：US17649967
申请日：2022-02-04
Applicant: QUALCOMM Incorporated
Inventor： Subbarao Surendra Chakkirala , Sherif Galal , Earl Schreyer
CPC classification number: H03F3/2175 , H03F1/0227 , H03F2200/03
Abstract: A hybrid class-H/predictive class-G switching amplifier architecture and techniques for amplifying a signal (e.g., an audio signal) using such an architecture. One example method of amplification generally includes delaying an input signal to generate a delayed version of the input signal, amplifying the delayed version of the input signal with an amplifier powered by a boost converter, and selectively controlling the boost converter to operate in at least one of a predictive class-G mode or a class-H mode, based on a magnitude of the input signal.
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公开(公告)号：US09742366B2
公开(公告)日：2017-08-22
申请号：US14798647
申请日：2015-07-14
Applicant: QUALCOMM Incorporated
Inventor： Sherif Galal
CPC classification number: H03F3/217 , H03F1/0205 , H03F1/34 , H03F3/187 , H03F3/19 , H03F3/211 , H03F3/45076 , H03F3/45475 , H03F3/45932 , H03F2200/03 , H03F2200/451 , H03F2203/21106 , H03F2203/45116
Abstract: A fully differential class-D amplifier having a controlled common-mode output voltage is disclosed. The differential class-D amplifier may include a correction circuit to determine the common-mode output voltage associated with differential pulse width modulated output signals and to generate differential correction signals to control the common-mode output voltage. In some exemplary embodiments, the differential class-D amplifier may include a plurality of gain stages to generate the differential PWM output signals. The differential correction signals may be provided to at least one stage of the differential class-D amplifier.
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公开(公告)号：US20170019078A1
公开(公告)日：2017-01-19
申请号：US14798647
申请日：2015-07-14
Applicant: QUALCOMM Incorporated
Inventor： Sherif Galal
CPC classification number: H03F3/217 , H03F1/0205 , H03F1/34 , H03F3/187 , H03F3/19 , H03F3/211 , H03F3/45076 , H03F3/45475 , H03F3/45932 , H03F2200/03 , H03F2200/451 , H03F2203/21106 , H03F2203/45116
Abstract: A fully differential class-D amplifier having a controlled common-mode output voltage is disclosed. The differential class-D amplifier may include a correction circuit to determine the common-mode output voltage associated with differential pulse width modulated output signals and to generate differential correction signals to control the common-mode output voltage. In some exemplary embodiments, the differential class-D amplifier may include a plurality of gain stages to generate the differential PWM output signals. The differential correction signals may be provided to at least one stage of the differential class-D amplifier.
Abstract translation: 公开了具有受控共模输出电压的全差分D类放大器。 差分D类放大器可以包括校正电路，以确定与差分脉宽调制输出信号相关联的共模输出电压，并产生差分校正信号以控制共模输出电压。 在一些示例性实施例中，差分D类放大器可以包括多个增益级以产生差分PWM输出信号。 差分校正信号可以被提供给差分D类放大器的至少一个级。
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公开(公告)号：US20160182998A1
公开(公告)日：2016-06-23
申请号：US14579756
申请日：2014-12-22
Applicant: QUALCOMM, Incorporated
Inventor： Sherif Galal , Xinwang Zhang
CPC classification number: H04R3/007 , H03F1/523 , H03F3/185 , H03F3/2173 , H03F2200/03 , H03F2200/321 , H03F2200/462 , H03F2203/45138 , H03G3/20 , H03G3/3005 , H03G7/002 , H03G11/00 , H04R29/003
Abstract: In one embodiment, a method for speaker operation comprises sensing an input common mode signal of a driver, wherein the driver drives a speaker, and adjusting the input common mode signal of the driver based on a difference between the sensed input common mode signal and a reference signal. The method also comprises sensing a current of a coil of the speaker, and control an output volume of the speaker based at least in part on the sensed current.
Abstract translation: 在一个实施例中，一种用于扬声器操作的方法包括感测驾驶员的输入共模信号，其中驱动器驱动扬声器，并且基于所感测的输入共模信号和 参考信号。 该方法还包括感测扬声器的线圈的电流，并且至少部分地基于所感测的电流来控制扬声器的输出音量。
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