Patents by Inventor Vijay Gadde
Vijay Gadde 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: 7898878Abstract: A data system component having a state machine circuit and receivers that utilize high and low threshold signals permits accurate detection of strobe signal pattern edges such as those for preamble, burst and post-amble conditions in the strobe signal. The state machine circuit may then be configured to set conditions associated with further circuit elements such as for power saving, data reception, on-die termination, etc. based on the conditions detected in the strobe signal to improve data or memory system performance. The components may be implemented as part of memory controllers and/or memory such as a dynamic random access memory and used in memory read and write operations.Type: GrantFiled: July 24, 2008Date of Patent: March 1, 2011Assignee: Rambus Inc.Inventors: Huy M. Nguyen, Vijay Gadde, Bret G. Stott
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Publication number: 20100318311Abstract: Described are amplifiers that facilitate high-speed communication with calibrated drive strength and termination impedance. Drivers and termination elements can be divided into a number N of parallel portions, one or more of which can be disabled and updated without interfering with signal (e.g., clock or data) transmission. Some embodiments identify inactive elements by examining incoming signals.Type: ApplicationFiled: August 3, 2010Publication date: December 16, 2010Applicant: Rambus Inc.Inventors: Huy M. Nguyen, Vijay Gadde, Sivakumar Doriaswamy
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Publication number: 20100259295Abstract: 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 21, 2010Publication date: October 14, 2010Applicant: Rambus Inc.Inventors: Huy M. Nguyen, Vijay Gadde, Benedict Lau
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Patent number: 7808278Abstract: Described are amplifiers that facilitate high-speed communication with calibrated drive strength and termination impedance. Drivers and termination elements can be divided into a number N of parallel portions, one or more of which can be disabled and updated without interfering with signal (e.g., clock or data) transmission. Some embodiments identify inactive elements by examining incoming signals.Type: GrantFiled: May 7, 2008Date of Patent: October 5, 2010Assignee: Rambus Inc.Inventors: Huy M. Nguyen, Vijay Gadde, Sivakumar Doriaswamy
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Publication number: 20100202227Abstract: A memory controller includes a transmit circuit coupled to an output node and a receive circuit coupled to an input node. The transmit circuit transmits first data to a memory device through the output node and the receive circuit is configured to receive second data from the memory device through the input node. The memory controller includes a calibration circuit and control logic coupled to the calibration circuit, where the calibration circuit and the control logic are configured to select a first reference voltage and a driver impedance for the transmit circuit and are configured to select a second reference voltage and a termination impedance for the receive circuit. The first reference voltage, the second reference voltage, the driver impedance and the termination impedance are selected from a set of pre-determined values, which are associated with different signaling modes for communication of the first data and the second data.Type: ApplicationFiled: May 20, 2008Publication date: August 12, 2010Applicant: RAMBUS INC.Inventors: Huy M. Nguyen, Vijay Gadde, Bret G. Stott
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Patent number: 7741868Abstract: 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: July 20, 2009Date of Patent: June 22, 2010Assignee: Rambus Inc.Inventors: Huy M. Nguyen, Vijay Gadde, Benedict Lau
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Publication number: 20090278565Abstract: 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: July 20, 2009Publication date: November 12, 2009Applicant: Rambus Inc.Inventors: Huy M. Nguyen, Vijay Gadde, Benedict Lau
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Patent number: 7564258Abstract: 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 17, 2007Date of Patent: July 21, 2009Assignee: Rambus Inc.Inventors: Huy M. Nguyen, Vijay Gadde, Benedict Lau
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Patent number: 7525338Abstract: 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: December 13, 2006Date of Patent: April 28, 2009Assignee: Rambus Inc.Inventors: Huy M. Nguyen, Vijay Gadde, Benedict Lau
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Publication number: 20090034344Abstract: A data system component having a state machine circuit and receivers that utilize high and low threshold signals permits accurate detection of strobe signal pattern edges such as those for preamble, burst and post-amble conditions in the strobe signal. The state machine circuit may then be configured to set conditions associated with further circuit elements such as for power saving, data reception, on-die termination, etc. based on the conditions detected in the strobe signal to improve data or memory system performance. The components may be implemented as part of memory controllers and/or memory such as a dynamic random access memory and used in memory read and write operations.Type: ApplicationFiled: July 24, 2008Publication date: February 5, 2009Applicant: Rambus, Inc.Inventors: Huy M. Nguyen, Vijay Gadde, Bret G. Stott
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Publication number: 20080211536Abstract: Described are amplifiers that facilitate high-speed communication with calibrated drive strength and termination impedance. Drivers and termination elements can be divided into a number N of parallel portions, one or more of which can be disabled and updated without interfering with signal (e.g., clock or data) transmission. Some embodiments identify inactive elements by examining incoming signals.Type: ApplicationFiled: May 7, 2008Publication date: September 4, 2008Inventors: Huy M. Nguyen, Vijay Gadde, Sivakumar Doriaswamy
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Patent number: 7389194Abstract: Described are amplifiers that facilitate high-speed communication with calibrated drive strength and tennination impedance. Drivers and termination elements can be divided into a number N of parallel portions, one or more of which can be updated while signals (e.g, clock or data) are transmitted. Some embodiments identify elements in a high-impedance state by examining incoming signals.Type: GrantFiled: July 6, 2005Date of Patent: June 17, 2008Assignee: Rambus Inc.Inventors: Huy M. Nguyen, Vijay Gadde, Sivakumar Doraiswamy
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Publication number: 20070290714Abstract: 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 17, 2007Publication date: December 20, 2007Inventors: Huy Nguyen, Vijay Gadde, Benedict Lau
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Publication number: 20070085562Abstract: 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: December 13, 2006Publication date: April 19, 2007Inventors: Huy Nguyen, Vijay Gadde, Benedict Lau
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Publication number: 20070010961Abstract: Described are amplifiers that facilitate high-speed communication with calibrated drive strength and termination impedance. Drivers and termination elements can be divided into a number N of parallel portions, one or more of which can be disabled and updated without interfering with signal (e.g., clock or data) transmission. Some embodiments identify inactive elements by examining incoming signals.Type: ApplicationFiled: July 6, 2005Publication date: January 11, 2007Inventors: Huy Nguyen, Vijay Gadde, Sivakumar Doriaswamy
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Patent number: 7151390Abstract: 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: April 6, 2005Date of Patent: December 19, 2006Assignee: Rambus Inc.Inventors: Huy M. Nguyen, Vijay Gadde, Benedict Lau
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Publication number: 20050174143Abstract: 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: April 6, 2005Publication date: August 11, 2005Inventors: Huy Nguyen, Vijay Gadde, Benedict Lau
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Patent number: 6924660Abstract: 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: September 8, 2003Date of Patent: August 2, 2005Assignee: Rambus Inc.Inventors: Huy M. Nguyen, Vijay Gadde, Benedict Lau
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Publication number: 20050052200Abstract: 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: September 8, 2003Publication date: March 10, 2005Inventors: Huy Nguyen, Vijay Gadde, Benedict Lau