Patents by Inventor James Cong Nguyen
James Cong Nguyen 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: 11791607Abstract: Various embodiments of a laser driver are described herein. In an embodiment, a laser driver system includes: an external set of inductors including a first external inductor and a second external inductor; an internal set of inductors including a first internal inductor and a second internal inductor; and a DC-to-DC convertor configured to bias a first output path defined by the first external inductor and the first internal inductor and a second output path defined by the second external inductor and the second internal inductor.Type: GrantFiled: April 6, 2021Date of Patent: October 17, 2023Assignee: Maxim Integrated Products, Inc.Inventors: Qingsheng Tan, James Cong Nguyen, Ashok K. Verma
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Publication number: 20210288466Abstract: Various embodiments of a laser driver are described herein. In an embodiment, a laser driver system includes: an external set of inductors including a first external inductor and a second external inductor; an internal set of inductors including a first internal inductor and a second internal inductor; and a DC-to-DC convertor configured to bias a first output path defined by the first external inductor and the first internal inductor and a second output path defined by the second external inductor and the second internal inductor.Type: ApplicationFiled: April 6, 2021Publication date: September 16, 2021Inventors: Qingsheng Tan, James Cong Nguyen, Ashok K. Verma
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Patent number: 10971894Abstract: Various embodiments of a laser driver are described herein. In an embodiment, a laser driver system includes: an external set of inductors including a first external inductor and a second external inductor; an internal set of inductors including a first internal inductor and a second internal inductor; and a DC-to-DC convertor configured to bias a first output path defined by the first external inductor and the first internal inductor and a second output path defined by the second external inductor and the second internal inductor.Type: GrantFiled: June 20, 2016Date of Patent: April 6, 2021Assignee: Maxim Integrated Products, Inc.Inventors: Qingsheng Tan, James Cong Nguyen, Ashok K. Verma
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Publication number: 20160372888Abstract: Various embodiments of a laser driver are described herein. In an embodiment, a laser driver system includes: an external set of inductors including a first external inductor and a second external inductor; an internal set of inductors including a first internal inductor and a second internal inductor; and a DC-to-DC convertor configured to bias a first output path defined by the first external inductor and the first internal inductor and a second output path defined by the second external inductor and the second internal inductor.Type: ApplicationFiled: June 20, 2016Publication date: December 22, 2016Inventors: Qingsheng Tan, James Cong Nguyen, Ashok K. Verma
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Patent number: 9209599Abstract: Symmetrical, direct coupled laser drivers for high frequency applications. The laser drivers are in integrated circuit form and use a minimum of relatively small (low valued) external components for driving a laser diode coupled to the laser driver through transmission lines. An optional amplifier may be used to fix the voltage at an internal node at data frequency spectrum to improve circuit performance. Feedback to a bias input may also be used to fix the voltage at the internal node. Programmability and a burst mode capability may be included.Type: GrantFiled: March 2, 2015Date of Patent: December 8, 2015Assignee: Maxim Integrated Products, Inc.Inventors: James Cong Nguyen, Ashok Kumar Verma
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Patent number: 9157797Abstract: An avalanche photo diode detector including an avalanche photo diode, an adjustable voltage source, a current mirror coupled to the voltage source output of the adjustable voltage source and having a current measurement output, and a processor coupled to the adjustable voltage source and the current mirror. The processor implements a process of obtaining a signal current measurement from the current mirror, computing an estimate of an input optical power level from the signal current measurement and adjusting the output of the adjustable voltage source based upon on the estimate of the input optical power level.Type: GrantFiled: March 14, 2013Date of Patent: October 13, 2015Assignee: Maxim Integrated Products, Inc.Inventors: James Cong Nguyen, Jan Filip
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Publication number: 20150188288Abstract: Symmetrical, direct coupled laser drivers for high frequency applications. The laser drivers are in integrated circuit form and use a minimum of relatively small (low valued) external components for driving a laser diode coupled to the laser driver through transmission lines. An optional amplifier may be used to fix the voltage at an internal node at data frequency spectrum to improve circuit performance. Feedback to a bias input may also be used to fix the voltage at the internal node. Programmability and a burst mode capability may be included.Type: ApplicationFiled: March 2, 2015Publication date: July 2, 2015Inventors: James Cong Nguyen, Ashok Kumar Verma
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Patent number: 8971365Abstract: Symmetrical, direct coupled laser drivers for high frequency applications. The laser drivers are in integrated circuit form and use a minimum of relatively small (low valued) external components for driving a laser diode coupled to the laser driver through transmission lines. An optional amplifier may be used to fix the voltage at an internal node at data frequency spectrum to improve circuit performance. Feedback to a bias input may also be used to fix the voltage at the internal node. Programmability and a burst mode capability may be included.Type: GrantFiled: January 17, 2012Date of Patent: March 3, 2015Assignee: Maxim Integrated Products, Inc.Inventors: James Cong Nguyen, Ashok Kumar Verma
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Publication number: 20140263946Abstract: An avalanche photo diode detector including an avalanche photo diode, an adjustable voltage source, a current mirror coupled to the voltage source output of the adjustable voltage source and having a current measurement output, and a processor coupled to the adjustable voltage source and the current mirror. The processor implements a process of obtaining a signal current measurement from the current mirror, computing an estimate of an input optical power level from the signal current measurement and adjusting the output of the adjustable voltage source based upon on the estimate of the input optical power level.Type: ApplicationFiled: March 14, 2013Publication date: September 18, 2014Inventors: James Cong Nguyen, Jan Filip
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Dual laser-power-level control and calibration system for burst-mode and continuous-mode transmitter
Patent number: 8576888Abstract: Dual laser-power-level control and calibration system for burst-mode and continuous-mode transmitter. A first signal path receives a transmit signal that also drives the transmit laser, and a second signal path receives the output of a monitor diode. The first and second signal paths include filtering so that the two signal paths have a similar frequency response. The upper and lower excursions in both signal paths are compared, and the power levels of the optical transmitter are adjusted based on those comparisons. Embodiments with one control loop and two control loops are disclosed.Type: GrantFiled: October 26, 2011Date of Patent: November 5, 2013Assignee: Maxim Integrated Products, Inc.Inventors: James Cong Nguyen, Matthew Christopher La Voie, Jan Filip -
Patent number: 8571079Abstract: Average-power control loops and methods through laser supply voltage closed-loop control. In accordance with one of the methods, a switching converter is coupled to provide power to a first terminal of a laser diode, a programmable current source is coupled to control the average current through a laser diode, an average power control circuit is coupled to a monitor diode to monitor the average power out of a laser diode and to control the programmable current source to maintain a desired average power out of a laser diode, and the output of the switching converter is adjusted responsive to the headroom of the programmable current source to limit the output of the switching converter to a voltage that will still assure adequate operation of the current source. Various embodiments are disclosed.Type: GrantFiled: May 29, 2012Date of Patent: October 29, 2013Assignee: Maxim Integrated Products, Inc.Inventor: James Cong Nguyen
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Publication number: 20120201260Abstract: Symmetrical, direct coupled laser drivers for high frequency applications. The laser drivers are in integrated circuit form and use a minimum of relatively small (low valued) external components for driving a laser diode coupled to the laser driver through transmission lines. An optional amplifier may be used to fix the voltage at an internal node at data frequency spectrum to improve circuit performance. Feedback to a bias input may also be used to fix the voltage at the internal node. Programmability and a burst mode capability may be included.Type: ApplicationFiled: January 17, 2012Publication date: August 9, 2012Applicant: MAXIM INTEGRATED PRODUCTS, INC.Inventors: James Cong Nguyen, Ashok Kumar Verma
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Dual Laser-Power-Level Control and Calibration System for Burst-Mode and Continuous-Mode Transmitter
Publication number: 20120106953Abstract: Dual laser-power-level control and calibration system for burst-mode and continuous-mode transmitter. A first signal path receives a transmit signal that also drives the transmit laser, and a second signal path receives the output of a monitor diode. The first and second signal paths include filtering so that the two signal paths have a similar frequency response. The upper and lower excursions in both signal paths are compared, and the power levels of the optical transmitter are adjusted based on those comparisons. Embodiments with one control loop and two control loops are disclosed.Type: ApplicationFiled: October 26, 2011Publication date: May 3, 2012Applicant: MAXIM INTEGRATED PRODUCTS, INC.Inventors: James Cong Nguyen, Matthew Christopher La Voie, Jan Filip -
Publication number: 20010009495Abstract: A direct-to-digital temperature sensor is formed with a single switched-capacitor integrator, having a digital sequencer control.Type: ApplicationFiled: February 12, 2001Publication date: July 26, 2001Inventor: James Cong Nguyen
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Patent number: 6215635Abstract: A direct-to-digital temperature sensor is formed with a single switched-capacitor integrator, having a digital sequencer control.Type: GrantFiled: September 25, 1998Date of Patent: April 10, 2001Assignee: Dallas Semiconductor CorporationInventor: James Cong Nguyen