Patents by Inventor Jianlong Chen
Jianlong Chen 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: 9413312Abstract: Presented are circuits and methods for providing real-time short-circuit detection, capable of detecting a short-circuit prior to occurrence of an over-limit current event. Such a circuit can be used to provide real-time short-circuit detection for a switched-mode system for a switched-mode system having a pre-driver and a power stage, and includes a reference block for generating a reference voltage according to drive signals provided by the pre-driver, and a comparator, which may be a synchronized comparator. The comparator is configured to compare the reference voltage to a switching node voltage generated in a power stage of the switched-mode system, and to produce an output enabling detection of the short-circuit in the switched-mode system.Type: GrantFiled: November 23, 2011Date of Patent: August 9, 2016Assignee: BROADCOM CORPORATIONInventors: Xicheng Jiang, Jianlong Chen, Sasi Kumar Arunachalam
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Patent number: 9287835Abstract: A low quiescent current amplifier and driver having multiple amplifiers (e.g. Class AB and B amplifiers) work in concert to independently amplify all or a portion of a signal into multiple amplified signals combined into a unified signal. Operation of a second amplifier is slaved to operation of a first amplifier. Each amplifier may have its own feedback loop providing the same gain transfer function to align transitions of the multiple amplified signals. Operation of the first amplifier may be detected using a replica of a signal, stage or transconductance in the first amplifier. At the same threshold, operation of the first and second amplifiers may be transitioned, e.g., the second amplifier may transition between providing increasing or decreasing current and providing zero current while the first amplifier may transition between providing constant current and providing increasing or decreasing current.Type: GrantFiled: December 11, 2012Date of Patent: March 15, 2016Assignee: Broadcom CorporationInventors: Jianlong Chen, Sasi Kumar Arunachalam, Todd L. Brooks
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Patent number: 8705752Abstract: A noise reduction circuit for reducing the effects of low frequency noise such as wind noise in communications applications is described. In one embodiment, the noise reduction circuit features a high pass filter formed by exploiting the existing off-chip AC coupling capacitances in making the connection to the source of audio signals. The filter may be adaptive to environmental low frequency noise level through programming the shunt resistances. A low-noise wide dynamic range programmable gain amplifier is also described. Adaptive equalization of the audio signal is also described through the utilization of programmable front-end resistors and a back-end audio equalizer.Type: GrantFiled: September 20, 2006Date of Patent: April 22, 2014Assignee: Broadcom CorporationInventors: Xicheng Jiang, Jungwoo Song, Jianlong Chen
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Publication number: 20140070889Abstract: A low quiescent current amplifier and driver having multiple amplifiers (e.g. Class AB and B amplifiers) work in concert to independently amplify all or a portion of a signal into multiple amplified signals combined into a unified signal. Operation of a second amplifier is slaved to operation of a first amplifier. Each amplifier may have its own feedback loop providing the same gain transfer function to align transitions of the multiple amplified signals. Operation of the first amplifier may be detected using a replica of a signal, stage or transconductance in the first amplifier. At the same threshold, operation of the first and second amplifiers may be transitioned, e.g., the second amplifier may transition between providing increasing or decreasing current and providing zero current while the first amplifier may transition between providing constant current and providing increasing or decreasing current.Type: ApplicationFiled: December 11, 2012Publication date: March 13, 2014Applicant: BROADCOM CORPORATIONInventors: Jianlong Chen, Sasi Kumar Arunachalam, Todd L. Brooks
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Publication number: 20130049763Abstract: Presented are circuits and methods for providing real-time short-circuit detection, capable of detecting a short-circuit prior to occurrence of an over-limit current event. Such a circuit can be used to provide real-time short-circuit detection for a switched-mode system for a switched-mode system having a pre-driver and a power stage, and includes a reference block for generating a reference voltage according to drive signals provided by the pre-driver, and a comparator, which may be a synchronized comparator. The comparator is configured to compare the reference voltage to a switching node voltage generated in a power stage of the switched-mode system, and to produce an output enabling detection of the short-circuit in the switched-mode system.Type: ApplicationFiled: November 23, 2011Publication date: February 28, 2013Applicant: BROADCOM CORPORATIONInventors: Xicheng Jiang, Jianlong Chen, Sasi Kumar Arunachalam
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Patent number: 8237495Abstract: Disclosed is a high efficiency amplifier operable to substantially reduce electromagnetic interference (EMI). The high efficiency amplifier comprises an output stage to provide a high powered signal to a load. The high efficiency amplifier further comprises an overlap protection circuit to produce a timing non-overlap in a control signal for the output stage, and an edge control circuit to reduce a transient portion of the high powered signal to substantially reduce the EMI. The overlap protection circuit and the edge control circuit may be implemented with resistive source degeneration. Also disclosed is a related method. In one embodiment, the high efficiency amplifier and the related method may be incorporated into a cellular telephone or a mobile audio device.Type: GrantFiled: July 7, 2010Date of Patent: August 7, 2012Assignee: Broadcom CorporationInventors: Xicheng Jiang, Jianlong Chen
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Publication number: 20120008240Abstract: Disclosed is a high efficiency amplifier operable to substantially reduce electromagnetic interference (EMI). The high efficiency amplifier comprises an output stage to provide a high powered signal to a load. The high efficiency amplifier further comprises an overlap protection circuit to produce a timing non-overlap in a control signal for the output stage, and an edge control circuit to reduce a transient portion of the high powered signal to substantially reduce the EMI. The overlap protection circuit and the edge control circuit may be implemented with resistive source degeneration. Also disclosed is a related method. In one embodiment, the high efficiency amplifier and the related method may be incorporated into a cellular telephone or a mobile audio device.Type: ApplicationFiled: July 7, 2010Publication date: January 12, 2012Applicant: BROADCOM CORPORATIONInventors: Xicheng Jiang, Jianlong Chen
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Publication number: 20080069373Abstract: A noise reduction circuit for reducing the effects of low frequency noise such as wind noise in communications applications is described. In one embodiment, the noise reduction circuit features a high pass filter formed by exploiting the existing off-chip AC coupling capacitances in making the connection to the source of audio signals. The filter may be adaptive to environmental low frequency noise level through programming the shunt resistances. A low-noise wide dynamic range programmable gain amplifier is also described. Adaptive equalization of the audio signal is also described through the utilization of programmable front-end resistors and a back-end audio equalizer.Type: ApplicationFiled: September 20, 2006Publication date: March 20, 2008Applicant: Broadcom CorporationInventors: Xicheng Jiang, Jungwoo Song, Jianlong Chen
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Patent number: D853453Type: GrantFiled: September 27, 2017Date of Patent: July 9, 2019Assignee: Sunrise Global Marketing LLCInventors: Nick Suchoza, Jianlong Chen
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Patent number: D867833Type: GrantFiled: April 18, 2018Date of Patent: November 26, 2019Assignee: Changzhou Globe Co., Ltd.Inventor: Jianlong Chen
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Patent number: D876734Type: GrantFiled: April 18, 2018Date of Patent: February 25, 2020Assignee: Changzhou Globe Co., Ltd.Inventor: Jianlong Chen
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Patent number: D900025Type: GrantFiled: August 19, 2019Date of Patent: October 27, 2020Assignee: Globe (Jiangsu) Co., Ltd.Inventors: Jianlong Chen, Yangping Qiu
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Patent number: D924794Type: GrantFiled: March 16, 2020Date of Patent: July 13, 2021Assignee: Globe (Jiangsu) Co., Ltd.Inventors: Jie Kuang, Song Zhang, Thomas Arnell, Jens Näslund, Jianlong Chen
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Patent number: D926397Type: GrantFiled: December 27, 2019Date of Patent: July 27, 2021Assignee: THE TORO COMPANYInventors: Philip C. Dretzka, Nicholas Suchoza, Jianlong Chen, Chang Wang
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Patent number: D932858Type: GrantFiled: March 16, 2020Date of Patent: October 12, 2021Assignee: Globe (Jiangsu) Co., Ltd.Inventors: Jie Kuang, Song Zhang, Jens Näslund, Jianlong Chen, Thomas Arnell
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Patent number: D960670Type: GrantFiled: December 27, 2019Date of Patent: August 16, 2022Inventors: Philip C. Dretzka, Nicholas Suchoza, Jianlong Chen, Xiaofei Miao
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Patent number: D975139Type: GrantFiled: September 8, 2021Date of Patent: January 10, 2023Assignee: Globe (Jiangsu) Co., Ltd.Inventors: Chris Eichel, Sheng Li, Jie Kuang, Jianlong Chen, Shidong Ma
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Patent number: D979252Type: GrantFiled: September 8, 2021Date of Patent: February 28, 2023Assignee: Globe (Jiangsu) Co., Ltd.Inventors: Chris Eichel, Sheng Li, Jie Kuang, Jianlong Chen, Shidong Ma
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Patent number: D1004390Type: GrantFiled: February 23, 2022Date of Patent: November 14, 2023Assignee: Globe (Jiangsu) Co., Ltd.Inventors: Qian Xu, Jianlong Chen
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Patent number: D1004391Type: GrantFiled: February 23, 2022Date of Patent: November 14, 2023Assignee: Globe (Jiangsu) Co., Ltd.Inventors: Qian Xu, Jianlong Chen