Patents by Inventor Xinwang Zhang
Xinwang Zhang has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 11885836Abstract: 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.Type: GrantFiled: December 27, 2022Date of Patent: January 30, 2024Assignee: QUALCOMM IncorporatedInventors: Ramkumar Sivakumar, Jingxue Lu, Sherif Galal, Xinwang Zhang, Kshitij Yadav
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Publication number: 20230238925Abstract: 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.Type: ApplicationFiled: January 26, 2022Publication date: July 27, 2023Inventors: Dongyang TANG, Xinwang ZHANG, ChienChung YANG, Earl SCHREYER, Sherif GALAL
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Patent number: 11683015Abstract: 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.Type: GrantFiled: August 17, 2021Date of Patent: June 20, 2023Assignee: QUALCOMM IncorporatedInventors: ChienChung Yang, Dongyang Tang, Sherif Galal, Xinwang Zhang, Subbarao Surendra Chakkirala, Pradeep Silva
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Publication number: 20230137935Abstract: 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.Type: ApplicationFiled: December 27, 2022Publication date: May 4, 2023Inventors: Ramkumar SIVAKUMAR, Jingxue LU, Sherif GALAL, Xinwang ZHANG, Kshitij YADAV
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Publication number: 20230058434Abstract: 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.Type: ApplicationFiled: August 17, 2021Publication date: February 23, 2023Inventors: ChienChung YANG, Dongyang TANG, Sherif GALAL, Xinwang ZHANG, Subbarao Surendra CHAKKIRALA, Pradeep SILVA
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Patent number: 11536749Abstract: 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.Type: GrantFiled: January 21, 2021Date of Patent: December 27, 2022Assignee: QUALCOMM IncorporatedInventors: Ramkumar Sivakumar, Jingxue Lu, Sherif Galal, Xinwang Zhang, Kshitij Yadav
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Patent number: 11424720Abstract: 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.Type: GrantFiled: March 23, 2020Date of Patent: August 23, 2022Assignee: QUALCOMM IncorporatedInventors: Pradeep Silva, Ramkumar Sivakumar, Qubo Zhou, Xinwang Zhang, Hanil Lee, Dongyang Tang, Vijayakumar Dhanasekaran
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Publication number: 20210297046Abstract: 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.Type: ApplicationFiled: March 23, 2020Publication date: September 23, 2021Inventors: Pradeep SILVA, Ramkumar SIVAKUMAR, Qubo ZHOU, Xinwang ZHANG, Hanil LEE, Dongyang TANG, Vijayakumar DHANASEKARAN
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Publication number: 20210231710Abstract: 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.Type: ApplicationFiled: January 21, 2021Publication date: July 29, 2021Inventors: Ramkumar SIVAKUMAR, Jingxue LU, Sherif GALAL, Xinwang ZHANG, Kshitij YADAV
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Patent number: 10979502Abstract: Embodiments of the present disclosure provide a method, device and computer program product for migrating data. The method comprises initiating a first migration job for a first client and a second migration job for a second client. The method also comprises setting a first cache file for the first client and a second cache file for the second client, and a cache file records a hash value of a migrated file of a client. Moreover, the method further comprises executing the first migration job and the second migration job in parallel, wherein the first migration job is executed using the first cache file and the second migration job is executed using the second cache file.Type: GrantFiled: August 30, 2018Date of Patent: April 13, 2021Assignee: EMC IP Holding Company LLCInventors: Yi Wang, Xinwang Zhang, Lili Lin, Qingxiao Zheng, Yang Wang
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Publication number: 20190327302Abstract: Embodiments of the present disclosure provide a method, device and computer program product for migrating data. The method comprises initiating a first migration job for a first client and a second migration job for a second client. The method also comprises setting a first cache file for the first client and a second cache file for the second client, and a cache file records a hash value of a migrated file of a client. Moreover, the method further comprises executing the first migration job and the second migration job in parallel, wherein the first migration job is executed using the first cache file and the second migration job is executed using the second cache file.Type: ApplicationFiled: August 30, 2018Publication date: October 24, 2019Inventors: Yi Wang, Xinwang Zhang, Lili Lin, Qingxiao Zheng, Yang Wang
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Patent number: 9473851Abstract: 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.Type: GrantFiled: December 22, 2014Date of Patent: October 18, 2016Assignee: QUALCOMM IncorporatedInventors: Sherif Galal, Xinwang Zhang
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Publication number: 20160182998Abstract: 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.Type: ApplicationFiled: December 22, 2014Publication date: June 23, 2016Inventors: Sherif Galal, Xinwang Zhang
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Patent number: 9312848Abstract: A driver circuit includes detectors responsive to the operating region that a driven switch is operating in. The driver circuit is operative to drive the gate of the driven switch at a speed responsive to the output of the detectors.Type: GrantFiled: October 10, 2014Date of Patent: April 12, 2016Assignee: QUALCOMM, IncorporatedInventors: Xinwang Zhang, Vijayakumar Dhanasekaran, Le Wang, Ankit Srivastava
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Publication number: 20150381161Abstract: A driver circuit includes detectors responsive to the operating region that a driven switch is operating in. The driver circuit is operative to drive the gate of the driven switch at a speed responsive to the output of the detectors.Type: ApplicationFiled: October 10, 2014Publication date: December 31, 2015Inventors: Xinwang Zhang, Vijayakumar Dhanasekaran, Le Wang, Ankit Srivastava