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Patent Agency Ranking
公开(公告)号：US20210297046A1
公开(公告)日：2021-09-23
申请号：US16827280
申请日：2020-03-23
Applicant: QUALCOMM Incorporated
Inventor： Pradeep SILVA , Ramkumar SIVAKUMAR , Qubo ZHOU , Xinwang ZHANG , Hanil LEE , Dongyang TANG , Vijayakumar DHANASEKARAN
Abstract: A power amplifier provides reduction of click and pop in audio applications. The power amplifier includes a first amplifier and an auxiliary amplifier. The auxiliary amplifier is used to ramp the power amplifier output from ground to an offset voltage to reduce the “click and pop” sound. The first amplifier and the auxiliary amplifier having a shared feedback loop. An output of the first amplifier and an output of the auxiliary amplifier may be switchably coupled to the shared feedback loop. A wave generator controls a switch to couple the first amplifier output or the auxiliary amplifier output to the shared feedback loop.
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公开(公告)号：US20230238925A1
公开(公告)日：2023-07-27
申请号：US17648958
申请日：2022-01-26
Applicant: QUALCOMM Incorporated
Inventor： Dongyang TANG , Xinwang ZHANG , ChienChung YANG , Earl SCHREYER , Sherif GALAL
IPC: H03F3/217
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：US20230137935A1
公开(公告)日：2023-05-04
申请号：US18146832
申请日：2022-12-27
Applicant: QUALCOMM Incorporated
Inventor： Ramkumar SIVAKUMAR , Jingxue LU , Sherif GALAL , Xinwang ZHANG , Kshitij YADAV
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.
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公开(公告)号：US20230058434A1
公开(公告)日：2023-02-23
申请号：US17404862
申请日：2021-08-17
Applicant: QUALCOMM Incorporated
Inventor： ChienChung YANG , Dongyang TANG , Sherif GALAL , Xinwang ZHANG , Subbarao Surendra CHAKKIRALA , Pradeep SILVA
Abstract: A class-D amplifier including a pulse width modulator including an input configured to receive a first signal based on an input signal, and an output configured to generate a pulse width modulated (PWM) signal; an H-bridge including an input coupled to an output of the pulse width modulator and an output coupled to a load, wherein the H-bridge is configured to generate an output signal across the load based on the PWM signal; and a deadtime compensation circuit coupled to the H-bridge, wherein the deadtime compensation circuit is configured to compensate for deadtime distortion in the output signal. The deadtime compensation circuit may be a feedback circuit between an output of the H-bridge and an input of the pulse width modulator, a pulse modification circuit at the output of the pulse width modulator, or an offset signal generating circuit providing an offset signal to the pulse width modulator.
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公开(公告)号：US20210231710A1
公开(公告)日：2021-07-29
申请号：US17154758
申请日：2021-01-21
Applicant: QUALCOMM Incorporated
Inventor： Ramkumar SIVAKUMAR , Jingxue LU , Sherif GALAL , Xinwang ZHANG , Kshitij YADAV
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.
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