Patents by Inventor Huy M. Nguyen
Huy M. 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: 11522544Abstract: Described are on-die termination (ODT) systems and methods that facilitate high-speed communication between a driver die and a receiver die interconnected via one or more signal transmission lines. An ODT control system in accordance with one embodiment calibrates and maintains termination resistances and drive currents to produce optimal output swing voltages. Comparison circuitry employed to calibrate the reference resistance is also used to calibrate the drive current. Termination elements in some embodiments are divided into two adjustable resistive portions, both of which are designed to minimize capacitive loading. One portion is optimized to produce a relatively high range of adjustment, while the other is optimized for fine-tuning and glitch-free switching.Type: GrantFiled: May 19, 2020Date of Patent: December 6, 2022Assignee: Rambus Inc.Inventors: Huy M. Nguyen, Vijay Gadde, Benedict Lau
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Patent number: 10880042Abstract: An apparatus includes first and second receiver circuits and a decision circuit. The first receiver circuit is configured to generate a first data symbol from a particular input data symbol of a plurality of input data symbols included in an input signal. The second receiver circuit is configured to generate a second data symbol from the particular input data symbol. The decision circuit is configured to select, using respective values of one or more previous output data symbols, either the first or second data symbol as a current output data symbol. In response to a change in value between successive input data symbols, the first and second receiver circuits are configured to generate the first and second data symbols with respective data valid windows with different durations.Type: GrantFiled: May 11, 2020Date of Patent: December 29, 2020Assignee: Apple Inc.Inventors: Mitesh D. Katakwar, Seong Hoon Lee, Huy M. Nguyen
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Publication number: 20200389254Abstract: An apparatus includes first and second receiver circuits and a decision circuit. The first receiver circuit is configured to generate a first data symbol from a particular input data symbol of a plurality of input data symbols included in an input signal. The second receiver circuit is configured to generate a second data symbol from the particular input data symbol. The decision circuit is configured to select, using respective values of one or more previous output data symbols, either the first or second data symbol as a current output data symbol. In response to a change in value between successive input data symbols, the first and second receiver circuits are configured to generate the first and second data symbols with respective data valid windows with different durations.Type: ApplicationFiled: May 11, 2020Publication date: December 10, 2020Inventors: Mitesh D. Katakwar, Seong Hoon Lee, Huy M. Nguyen
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Publication number: 20200350913Abstract: Described are on-die termination (ODT) systems and methods that facilitate high-speed communication between a driver die and a receiver die interconnected via one or more signal transmission lines. An ODT control system in accordance with one embodiment calibrates and maintains termination resistances and drive currents to produce optimal output swing voltages. Comparison circuitry employed to calibrate the reference resistance is also used to calibrate the drive current. Termination elements in some embodiments are divided into two adjustable resistive portions, both of which are designed to minimize capacitive loading. One portion is optimized to produce a relatively high range of adjustment, while the other is optimized for fine-tuning and glitch-free switching.Type: ApplicationFiled: May 19, 2020Publication date: November 5, 2020Inventors: Huy M. Nguyen, Vijay Gadde, Benedict Lau
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Patent number: 10727895Abstract: A transceiver circuit having a T-coil circuit, inductive termination, and an equalization circuit is disclosed. The transceiver includes a transmitter having an output coupled to a first node, and a receiver having an input coupled to the first node. A T-coil circuit is coupled between the first node and an input/output (I/O) node. The T-coil circuit includes first and second inductors coupled in series between the first node and the I/O node, the inductors being coupled at a second node. A termination circuit is coupled between the first node and a reference node, the termination circuit including a third inductor. The transceiver circuit also includes an equalization circuit configured to convey an equalization signal to the second node.Type: GrantFiled: September 27, 2019Date of Patent: July 28, 2020Assignee: Apple Inc.Inventors: Huy M. Nguyen, Cristian Gozzi, Huabo Chen, Xuchen Zhang, Yu Chang
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Patent number: 10666254Abstract: Described are on-die termination (ODT) systems and methods that facilitate high-speed communication between a driver die and a receiver die interconnected via one or more signal transmission lines. An ODT control system in accordance with one embodiment calibrates and maintains termination resistances and drive currents to produce optimal output swing voltages. Comparison circuitry employed to calibrate the reference resistance is also used to calibrate the drive current. Termination elements in some embodiments are divided into two adjustable resistive portions, both of which are designed to minimize capacitive loading. One portion is optimized to produce a relatively high range of adjustment, while the other is optimized for fine-tuning and glitch-free switching.Type: GrantFiled: March 18, 2019Date of Patent: May 26, 2020Assignee: Rambus Inc.Inventors: Huy M. Nguyen, Vijay Gadde, Benedict Lau
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Patent number: 10651979Abstract: An apparatus includes first and second receiver circuits and a decision circuit. The first receiver circuit is configured to generate a first data symbol from a particular input data symbol of a plurality of input data symbols included in an input signal. The second receiver circuit is configured to generate a second data symbol from the particular input data symbol. The decision circuit is configured to select, using respective values of one or more previous output data symbols, either the first or second data symbol as a current output data symbol. In response to a change in value between successive input data symbols, the first and second receiver circuits are configured to generate the first and second data symbols with respective data valid windows with different durations.Type: GrantFiled: June 4, 2019Date of Patent: May 12, 2020Assignee: Apple Inc.Inventors: Mitesh D. Katakwar, Seong Hoon Lee, Huy M. Nguyen
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Patent number: 10566963Abstract: A method and apparatus for receiving reduced voltage swing signals is disclosed. A first amplifier may generate a first intermediate signal based on a difference between voltage levels of a first and second input signals, and a second amplifier may generate a second intermediate signal based on a difference in the voltage levels between the second and first input signals. A regenerative amplifier may increase a difference in the voltage level of the first and second intermediate signals using regenerative feedback and the voltage levels of the first and second input signals. A latch circuit may generate first and second output signals using the first and second intermediate signals.Type: GrantFiled: April 29, 2019Date of Patent: February 18, 2020Assignee: Apple Inc.Inventors: Huy M. Nguyen, Seong Hoon Lee
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Publication number: 20190326896Abstract: A method and apparatus for receiving reduced voltage swing signals is disclosed. A first amplifier may generate a first intermediate signal based on a difference between voltage levels of a first and second input signals, and a second amplifier may generate a second intermediate signal based on a difference in the voltage levels between the second and first input signals. A regenerative amplifier may increase a difference in the voltage level of the first and second intermediate signals using regenerative feedback and the voltage levels of the first and second input signals. A latch circuit may generate first and second output signals using the first and second intermediate signals.Type: ApplicationFiled: April 29, 2019Publication date: October 24, 2019Inventors: Huy M. Nguyen, Seong Hoon Lee
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Publication number: 20190305777Abstract: Described are on-die termination (ODT) systems and methods that facilitate high-speed communication between a driver die and a receiver die interconnected via one or more signal transmission lines. An ODT control system in accordance with one embodiment calibrates and maintains termination resistances and drive currents to produce optimal output swing voltages. Comparison circuitry employed to calibrate the reference resistance is also used to calibrate the drive current. Termination elements in some embodiments are divided into two adjustable resistive portions, both of which are designed to minimize capacitive loading. One portion is optimized to produce a relatively high range of adjustment, while the other is optimized for fine-tuning and glitch-free switching.Type: ApplicationFiled: March 18, 2019Publication date: October 3, 2019Inventors: Huy M. Nguyen, Vijay Gadde, Benedict Lau
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Patent number: 10304530Abstract: Systems, apparatuses, and methods for generating a reference voltage are described. In various embodiments, an interface between a memory and a processor uses a reference voltage generator to generate a reference voltage for a single pin or a small group of pins. The generator generates a default reference voltage from a first tap in a resistor ladder, injects current with a current controller into a second tap of the resistor ladder when the generator receives an indication to generate a larger reference voltage, and draws current from a third tap of the resistor ladder when the generator receives an indication to generate a smaller reference voltage. The generator also generates a high threshold voltage independent of a low threshold voltage after calibration.Type: GrantFiled: August 23, 2017Date of Patent: May 28, 2019Assignee: Apple Inc.Inventors: Huy M. Nguyen, Seong Hoon Lee
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Patent number: 10277216Abstract: A method and apparatus for receiving reduced voltage swing signals is disclosed. A first amplifier may generate a first intermediate signal based on a difference between voltage levels of a first and second input signals, and a second amplifier may generate a second intermediate signal based on a difference in the voltage levels between the second and first input signals. A regenerative amplifier may increase a difference in the voltage level of the first and second intermediate signals using regenerative feedback and the voltage levels of the first and second input signals. A latch circuit may generate first and second output signals using the first and second intermediate signals.Type: GrantFiled: September 27, 2017Date of Patent: April 30, 2019Assignee: Apple Inc.Inventors: Huy M. Nguyen, Seong Hoon Lee
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Patent number: 10270441Abstract: Described are on-die termination (ODT) systems and methods that facilitate high-speed communication between a driver die and a receiver die interconnected via one or more signal transmission lines. An ODT control system in accordance with one embodiment calibrates and maintains termination resistances and drive currents to produce optimal output swing voltages. Comparison circuitry employed to calibrate the reference resistance is also used to calibrate the drive current. Termination elements in some embodiments are divided into two adjustable resistive portions, both of which are designed to minimize capacitive loading. One portion is optimized to produce a relatively high range of adjustment, while the other is optimized for fine-tuning and glitch-free switching.Type: GrantFiled: August 24, 2017Date of Patent: April 23, 2019Assignee: Rambus Inc.Inventors: Huy M. Nguyen, Vijay Gadde, Benedict Lau
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Publication number: 20190066777Abstract: Systems, apparatuses, and methods for generating a reference voltage are described. In various embodiments, an interface between a memory and a processor uses a reference voltage generator to generate a reference voltage for a single pin or a small group of pins. The generator generates a default reference voltage from a first tap in a resistor ladder, injects current with a current controller into a second tap of the resistor ladder when the generator receives an indication to generate a larger reference voltage, and draws current from a third tap of the resistor ladder when the generator receives an indication to generate a smaller reference voltage. The generator also generates a high threshold voltage independent of a low threshold voltage after calibration.Type: ApplicationFiled: August 23, 2017Publication date: February 28, 2019Inventors: Huy M. Nguyen, Seong Hoon Lee
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Patent number: 10067519Abstract: An integrated circuit includes a voltage regulator to supply a regulated voltage and a data output that couples to an unterminated transmission line. The circuit draws a variable amount of power from the voltage regulator according to the data. The voltage regulator includes a first current generation circuit to provide a data transition-dependent current.Type: GrantFiled: June 17, 2017Date of Patent: September 4, 2018Assignee: Rambus Inc.Inventors: Brian S. Leibowitz, Michael D. Bucher, Lei Luo, Chaofeng Charlie Huang, Amir Amirkhany, Huy M. Nguyen, Hsuan-Jung (Bruce) Su, John Wilson
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Publication number: 20180019752Abstract: Described are on-die termination (ODT) systems and methods that facilitate high-speed communication between a driver die and a receiver die interconnected via one or more signal transmission lines. An ODT control system in accordance with one embodiment calibrates and maintains termination resistances and drive currents to produce optimal output swing voltages. Comparison circuitry employed to calibrate the reference resistance is also used to calibrate the drive current. Termination elements in some embodiments are divided into two adjustable resistive portions, both of which are designed to minimize capacitive loading. One portion is optimized to produce a relatively high range of adjustment, while the other is optimized for fine-tuning and glitch-free switching.Type: ApplicationFiled: August 24, 2017Publication date: January 18, 2018Inventors: Huy M. Nguyen, Vijay Gadde, Benedict Lau
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Publication number: 20170351282Abstract: An integrated circuit includes a voltage regulator to supply a regulated voltage and a data output that couples to an unterminated transmission line. The circuit draws a variable amount of power from the voltage regulator according to the data. The voltage regulator includes a first current generation circuit to provide a data transition-dependent current.Type: ApplicationFiled: June 17, 2017Publication date: December 7, 2017Inventors: Brian S. Leibowitz, Michael D. Bucher, Lei Luo, Chaofeng Charlie Huang, Amir Amirkhany, Huy M. Nguyen, Hsuan-Jung (Bruce) Su, John Wilson
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Patent number: 9780784Abstract: Described are on-die termination (ODT) systems and methods that facilitate high-speed communication between a driver die and a receiver die interconnected via one or more signal transmission lines. An ODT control system in accordance with one embodiment calibrates and maintains termination resistances and drive currents to produce optimal output swing voltages. Comparison circuitry employed to calibrate the reference resistance is also used to calibrate the drive current. Termination elements in some embodiments are divided into two adjustable resistive portions, both of which are designed to minimize capacitive loading. One portion is optimized to produce a relatively high range of adjustment, while the other is optimized for fine-tuning and glitch-free switching.Type: GrantFiled: June 24, 2016Date of Patent: October 3, 2017Assignee: Rambus Inc.Inventors: Huy M. Nguyen, Vijay Gadde, Benedict Lau
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Patent number: 9684321Abstract: An integrated circuit includes a voltage regulator to supply a regulated voltage and a data output that couples to an unterminated transmission line. The circuit draws a variable amount of power from the voltage regulator according to the data. The voltage regulator includes a first current generation circuit to provide a data transition-dependent current.Type: GrantFiled: April 29, 2015Date of Patent: June 20, 2017Assignee: Rambus Inc.Inventors: Brian S. Leibowitz, Michael D. Bucher, Lei Luo, Chaofeng Charlie Huang, Amir Amirkhany, Huy M. Nguyen, Hsuan-Jung (Bruce) Su, John Wilson
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Publication number: 20170012623Abstract: Described are on-die termination (ODT) systems and methods that facilitate high-speed communication between a driver die and a receiver die interconnected via one or more signal transmission lines. An ODT control system in accordance with one embodiment calibrates and maintains termination resistances and drive currents to produce optimal output swing voltages. Comparison circuitry employed to calibrate the reference resistance is also used to calibrate the drive current. Termination elements in some embodiments are divided into two adjustable resistive portions, both of which are designed to minimize capacitive loading. One portion is optimized to produce a relatively high range of adjustment, while the other is optimized for fine-tuning and glitch-free switching.Type: ApplicationFiled: June 24, 2016Publication date: January 12, 2017Inventors: Huy M. Nguyen, Vijay Gadde, Benedict Lau