Patents by Inventor Alex Jianzhong Chen
Alex Jianzhong 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: 11290008Abstract: A resonant switched-capacitor converter is provided. The resonant switched-capacitor is configured to convert an input voltage on an input terminal of the resonant switched-capacitor converter into an output voltage on an output terminal of the resonant switched-capacitor converter. The resonant switched-capacitor converter includes a first resonant tank, a second resonant tank, a non-resonant capacitor, and a connection control circuit coupled to the input terminal, the output terminal, the first resonant tank, the second resonant tank and the non-resonant capacitor. The connection control circuit is configured to control connections of the first resonant tank, the second resonant tank and the non-resonant capacitor.Type: GrantFiled: March 24, 2020Date of Patent: March 29, 2022Assignee: MediaTek Singapore Pte. Ltd.Inventors: Alex Jianzhong Chen, Yung-Chih Yen
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Publication number: 20200313550Abstract: A resonant switched-capacitor converter is provided. The resonant switched-capacitor is configured to convert an input voltage on an input terminal of the resonant switched-capacitor converter into an output voltage on an output terminal of the resonant switched-capacitor converter. The resonant switched-capacitor converter includes a first resonant tank, a second resonant tank, a non-resonant capacitor, and a connection control circuit coupled to the input terminal, the output terminal, the first resonant tank, the second resonant tank and the non-resonant capacitor. The connection control circuit is configured to control connections of the first resonant tank, the second resonant tank and the non-resonant capacitor.Type: ApplicationFiled: March 24, 2020Publication date: October 1, 2020Inventors: Alex Jianzhong Chen, Yung-Chih Yen
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Patent number: 8923492Abstract: A multi-mode line driver circuit designed to be fabricated in a CMOS process and capable of supporting a plurality of operating modes corresponding, for example, to different profiles of communication standards such as xDSL standards. The line driver circuit incorporates integrated mode switches with a two-stage amplifier architecture to relax amplifier requirements by distributing the signal gain into two amplifier stages. Reconfigurable feedback loops are provided to permit design optimization for particular modes of operation (e.g., ADSL and VDSL compliant modes). In one embodiment implemented as a Class-H amplifier, lift amplifier(s) are provided between a first amplifier stage and a second amplifier stage for controlling voltage supply levels of the second amplifier stage. The lift amplifiers may be enabled by voltage threshold detection circuitry that monitors either the input or the output signals of the first amplifier stage depending on the operable transmission mode.Type: GrantFiled: March 26, 2013Date of Patent: December 30, 2014Assignee: Broadcom CorporationInventors: Hui Zheng, Sasi Kumar Arunachalam, Alex Jianzhong Chen, Aravind Kumar Padyana, I-Ning Ku, Jungwoo Song, Xicheng Jiang
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Publication number: 20140254779Abstract: A multi-mode line driver circuit designed to be fabricated in a CMOS process and capable of supporting a plurality of operating modes corresponding, for example, to different profiles of communication standards such as xDSL standards. The line driver circuit incorporates integrated mode switches with a two-stage amplifier architecture to relax amplifier requirements by distributing the signal gain into two amplifier stages. Reconfigurable feedback loops are provided to permit design optimization for particular modes of operation (e.g., ADSL and VDSL compliant modes). In one embodiment implemented as a Class-H amplifier, lift amplifier(s) are provided between a first amplifier stage and a second amplifier stage for controlling voltage supply levels of the second amplifier stage. The lift amplifiers may be enabled by voltage threshold detection circuitry that monitors either the input or the output signals of the first amplifier stage depending on the operable transmission mode.Type: ApplicationFiled: March 26, 2013Publication date: September 11, 2014Applicant: Broadcom CorporationInventors: Hui Zheng, Sasi Kumar Arunachalam, Alex Jianzhong Chen, Aravind Kumar Padyana, I-Ning Ku, Jungwoo Song, Xicheng Jiang
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Patent number: 8766722Abstract: Disclosed is a Class-AB/B amplifier comprising a first output stage including a first plurality of amplification devices and a second output stage including a second plurality of amplification devices. According to one embodiment, the first output stage operates when the Class-AB/B amplifier is in a quiescent state and the second output stage operates when the Class-AB/B amplifier is in an active state. The Class-AB/B amplifier also comprises a level shifting circuit that adjusts a control voltage of the second output stage, where the level shifting circuit is adapted to activate the second output stage when the Class-AB/B amplifier enters the active state. Embodiments of the Class-AB/B amplifier may include a level shifting circuit that implements either a fixed or signal-dependent level shift, and a quiescent control circuit that substantially eliminates any systematic offset arising from the active feedback circuit inside the replica bias circuit.Type: GrantFiled: October 18, 2012Date of Patent: July 1, 2014Assignee: Broadcom CorporationInventors: Sherif Galal, Alex Jianzhong Chen, Khaled Abdelfattah, Todd L. Brooks
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Patent number: 8665023Abstract: Disclosed is a Class-AB/B amplifier comprising a first output stage including a first plurality of amplification devices and a second output stage including a second plurality of amplification devices. According to one embodiment, the first output stage operates when the Class-AB/B amplifier is in a quiescent state and the second output stage operates when the Class-AB/B amplifier is in an active state. The Class-AB/B amplifier also comprises a level shifting circuit that adjusts a control voltage of the second output stage, where the level shifting circuit is adapted to activate the second output stage when the Class-AB/B amplifier enters the active state. Embodiments of the Class-AB/B amplifier may include a level shifting circuit that implements either a fixed or signal-dependent level shift, and a quiescent control circuit that substantially eliminates any systematic offset arising from the active feedback circuit inside the replica bias circuit.Type: GrantFiled: October 18, 2012Date of Patent: March 4, 2014Assignee: Broadcom CorporationInventors: Sherif Galal, Alex Jianzhong Chen, Khaled Abdelfattah, Todd L. Brooks
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Patent number: 8294518Abstract: Disclosed is a Class-AB/B amplifier comprising a first output stage including a first plurality of amplification devices and a second output stage including a second plurality of amplification devices. According to one embodiment, the first output stage operates when the Class-AB/B amplifier is in a quiescent state and the second output stage operates when the Class-AB/B amplifier is in an active state. The Class-AB/B amplifier also comprises a level shifting circuit that adjusts a control voltage of the second output stage, where the level shifting circuit is adapted to activate the second output stage when the Class-AB/B amplifier enters the active state. Embodiments of the Class-AB/B amplifier may include a level shifting circuit that implements either a fixed or signal-dependent level shift, and a quiescent control circuit that substantially eliminates any systematic offset arising from the active feedback circuit inside the replica bias circuit.Type: GrantFiled: September 3, 2010Date of Patent: October 23, 2012Assignee: Broadcom CorporationInventors: Sherif Galal, Alex Jianzhong Chen, Khaled Abdelfattah, Todd L. Brooks
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Publication number: 20120056672Abstract: Disclosed is a Class-AB/B amplifier comprising a first output stage including a first plurality of amplification devices and a second output stage including a second plurality of amplification devices. According to one embodiment, the first output stage operates when the Class-AB/B amplifier is in a quiescent state and the second output stage operates when the Class-AB/B amplifier is in an active state. The Class-AB/B amplifier also comprises a level shifting circuit that adjusts a control voltage of the second output stage, where the level shifting circuit is adapted to activate the second output stage when the Class-AB/B amplifier enters the active state. Embodiments of the Class-AB/B amplifier may include a level shifting circuit that implements either a fixed or signal-dependent level shift, and a quiescent control circuit that substantially eliminates any systematic offset arising from the active feedback circuit inside the replica bias circuit.Type: ApplicationFiled: September 3, 2010Publication date: March 8, 2012Applicant: BROADCOM CORPORATIONInventors: Sherif Galal, Alex Jianzhong Chen, Khaled Abdelfattah, Todd L. Brooks
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Patent number: 8067992Abstract: Disclosed are various embodiments of temperature-compensated relaxation oscillator circuits that may be fabricated using conventional CMOS manufacturing techniques. The relaxation oscillator circuits described herein exhibit superior low temperature coefficient performance characteristics, and do not require the use of expensive off-chip high precision resistors to effect temperature compensation. Positive and negative temperature coefficient resistors arranged in a resistor array offset one another to provide temperature compensation in the relaxation oscillator circuit.Type: GrantFiled: June 6, 2008Date of Patent: November 29, 2011Assignee: Avago Technologies ECBU IP (Singapore) Pte. Ltd.Inventors: Alex Jianzhong Chen, Gim Eng Chew, Tong Tee Tan, Kok Chin Pan
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Publication number: 20090302954Abstract: Disclosed are various embodiments of temperature-compensated relaxation oscillator circuits that may be fabricated using conventional CMOS manufacturing techniques. The relaxation oscillator circuits described herein exhibit superior low temperature coefficient performance characteristics, and do not require the use of expensive off-chip high precision resistors to effect temperature compensation. Positive and negative temperature coefficient resistors arranged in a resistor array offset one another to provide temperature compensation in the relaxation oscillator circuit.Type: ApplicationFiled: June 6, 2008Publication date: December 10, 2009Applicant: Avago Technologies ECBU (Singapore) Ple. Ltd.Inventors: Alex Jianzhong Chen, Gim Eng Chew, Tong Tee Tan, Kok Chin Pan