Patents by Inventor Daniel N. De Araujo
Daniel N. De Araujo 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: 9306694Abstract: Methods, apparatus, and computer program products are disclosed for clock signal synchronization among computers in a network, including designating, as a primary clock signal for all the computers in a network, a clock signal from one of the computers in the network; providing the primary clock signal, simultaneously and in parallel, from the computer whose clock signal is designated as the primary clock signal to all the other computers in the network; and providing the primary clock signal, simultaneously and in parallel, from each computer in the network to all computers in the network through multiplexers and phase locked loops, with the primary clock signal locked in phase across all the computers by a phase locked loop on each computer.Type: GrantFiled: April 17, 2012Date of Patent: April 5, 2016Assignee: Lenovo Enterprise Solutions (Singapore) Pte. Ltd.Inventors: Daniel N. de Araujo, James T. Hanna, James O. Nicholson, Bruce J. Wilkie
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Publication number: 20120327622Abstract: Embodiments of the present invention address deficiencies of the art in respect to via structure utilization in a PCB design and provide a novel and non-obvious method, system and computer program product for impedance discontinuity remediation for via stubs and connectors in a PCB. In one embodiment a method for impedance discontinuity remediation in a PCB can be provided. The method can include configuring a pre-distortion filter to negate an impedance discontinuity in an electrical signal caused by a transmission line with one of a via stub or a connector. The method further can include pre-distortion filtering an electrical signal before transmitting the electrical signal over the transmission line. Finally, the method can include transmitting the pre-distortion filtered electrical signal over the transmission line.Type: ApplicationFiled: September 4, 2012Publication date: December 27, 2012Applicant: International Business Machines CorporationInventors: Justin P. Bandholz, Moises Cases, Robert J. Christopher, Daniel N. de Araujo, Bradley D. Herrman, Erdem Matoglu, Bhyrav M. Mutnury, Pravin S. Patel, Nam H. Pham
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Patent number: 8289101Abstract: Embodiments of the present invention address deficiencies of the art in respect to via structure utilization in a PCB design and provide a novel and non-obvious method, system and computer program product for impedance discontinuity remediation for via stubs and connectors in a PCB. In one embodiment a method for impedance discontinuity remediation in a PCB can be provided. The method can include configuring a pre-distortion filter to negate an impedance discontinuity in an electrical signal caused by a transmission line with one of a via stub or a connector. The method further can include pre-distortion filtering an electrical signal before transmitting the electrical signal over the transmission line. Finally, the method can include transmitting the pre-distortion filtered electrical signal over the transmission line.Type: GrantFiled: April 19, 2007Date of Patent: October 16, 2012Assignee: International Business Machines CorporationInventors: Justin P. Bandholz, Moises Cases, Robert J. Christopher, Daniel N. de Araujo, Bradley D. Herrman, Erdem Matoglu, Bhyrav M. Mutnury, Pravin S. Patel, Nam H. Pham
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Publication number: 20120203933Abstract: Methods, apparatus, and computer program products are disclosed for clock signal synchronization among computers in a network, including designating, as a primary clock signal for all the computers in a network, a clock signal from one of the computers in the network; providing the primary clock signal, simultaneously and in parallel, from the computer whose clock signal is designated as the primary clock signal to all the other computers in the network; and providing the primary clock signal, simultaneously and in parallel, from each computer in the network to all computers in the network through multiplexers and phase locked loops, with the primary clock signal locked in phase across all the computers by a phase locked loop on each computer.Type: ApplicationFiled: April 17, 2012Publication date: August 9, 2012Applicant: INTERNATIONAL BUSINESS MACHINES CORPORATIONInventors: Daniel N. de Araujo, James T. Hanna, James O. Nicholson, Bruce J. Wilkie
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Patent number: 8199695Abstract: Methods, apparatus, and computer program products are disclosed for clock signal synchronization among computers in a network, including designating, as a primary clock signal for all the computers in a network, a clock signal from one of the computers in the network; providing the primary clock signal, simultaneously and in parallel, from the computer whose clock signal is designated as the primary clock signal to all the other computers in the network; and providing the primary clock signal, simultaneously and in parallel, from each computer in the network to all computers in the network through multiplexers and phase locked loops, with the primary clock signal locked in phase across all the computers by a phase locked loop on each computer.Type: GrantFiled: April 10, 2007Date of Patent: June 12, 2012Assignee: International Business Machines CorporationInventors: Daniel N. de Araujo, James T. Hanna, James O. Nicholson, Bruce J. Wilkie
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Patent number: 7977574Abstract: Cables and methods of manufacturing cables for high speed data communications, the cable including: a first inner conductor enclosed by a first dielectric layer and a second inner conductor enclosed by a second dielectric layer, the inner conductors and the dielectric layers parallel with and along a longitudinal axis; and folded conductive shield material wrapped in a rotational direction along and about the longitudinal axis around the inner conductors and the dielectric layers, including overlapped wraps along and about the longitudinal axis, the conductive shield material comprising a first conductive layer and second conductive layer separated by an inner-shield dielectric layer.Type: GrantFiled: November 5, 2008Date of Patent: July 12, 2011Assignee: International Business Machines CorporationInventors: Moises Cases, Daniel N. De Araujo, Bhyrav M. Mutnury, Bruce J. Wilkie
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Patent number: 7944963Abstract: The present invention provides a simple, easy to implement method and apparatus to reduce jitter in a channel and expand the eye width and eye height of the eye pattern of the signal. The method and apparatus of the present invention reduces jitter specific to a channel in a high speed interface. The present invention utilizes a phasing shifting mechanism based on history of the incoming bits at the receiver. The input bits from the channel are shifted in time before getting to the receiver. This approach significantly reduces Intersymbol Interference (ISI) and deterministic jitter, thus opening up the eye width and eye height for a given interface.Type: GrantFiled: December 28, 2007Date of Patent: May 17, 2011Assignee: International Business Machines CorporationInventors: Moises Cases, Daniel N. de Araujo, Bhyrav M. Mutnury, Terence Rodrigues
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Patent number: 7813447Abstract: An apparatus, system, and method are disclosed for dynamic phase equalization in a communication channel. A transmitter history module stores a plurality of bits from a data stream that is transmitted through the communication channel. A transmitter detection module detects a pre-transition bit of a first value that is preceded in the data stream by at least one bit of the first value and followed by a transition bit with a second value. A driver module transmits the data stream by driving the communication channel. A transition module pre-drives the communication channel to the second voltage of the transition bit during a bit time interval of the pre-transition bit.Type: GrantFiled: November 15, 2006Date of Patent: October 12, 2010Assignee: International Business Machines CorporationInventors: Daniel N. De Araujo, Moises Cases, Bradley D. Herrman, Erdem Matoglu, Bhyrav M. Mutnury, Pravin S. Patel, Nam H. Pham
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Patent number: 7739562Abstract: A programmable diagnostic memory module provides enhanced testability of memory controller and memory subsystem design. The programmable diagnostic memory module includes an interface for communicating with an external diagnostic system, and the interface is used to transfer commands to the memory module to alter various behaviors of the memory module. The altered behaviors may be changing data streams that are written to the memory module to simulate errors, altering the timing and/or loading of the memory module signals, downloading programs for execution by a processor core within the memory module, changing driver strengths of output signals of the memory module, and manipulating in an analog domain, signals at terminals of the memory module such as injecting noise on power supply connections to the memory module. The memory module may emulate multiple selectable memory module types, and may include a complete storage array to provide standard memory module operation.Type: GrantFiled: August 17, 2007Date of Patent: June 15, 2010Assignee: International Business Machines CorporationInventors: Moises Cases, Daniel Mark Dreps, Bhyrav M. Mutnury, Nam H. Pham, Daniel N. De Araujo
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Patent number: 7730369Abstract: A method for performing memory diagnostics using a programmable diagnostic memory module provides enhanced testability of memory controller and memory subsystem design. The programmable diagnostic memory module includes an interface for communicating with an external diagnostic system, and the interface is used to transfer commands to the memory module to alter various behaviors of the memory module. The altered behaviors may be changing data streams that are written to the memory module to simulate errors, altering the timing and/or loading of the memory module signals, downloading programs for execution by a processor core within the memory module, changing driver strengths of output signals of the memory module, and manipulating in an analog domain, signals at terminals of the memory module such as injecting noise on power supply connections to the memory module.Type: GrantFiled: August 17, 2007Date of Patent: June 1, 2010Assignee: International Business Machines CorporationInventors: Moises Cases, Daniel Mark Dreps, Bhyrav M. Mutnury, Nam H. Pham, Daniel N. De Araujo
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Patent number: 7725783Abstract: The present invention assesses memory (DIMM) strength by calculating frequency content of a radiated field which is collected by an apparatus, such as a dipole antenna. Radiated field is created by accelerated charge, which is a function of the slew rate or DIMM strength. Radiated power is directly proportional to the frequency at which bits are driven. By separating the radiated field from the near field or stored field, the DIMM strength content is isolated from other functional DIMM issues, such as tRCD latency, refresh cycles, addressing mode, etc. By examining the radiated power, the disadvantages of the prior art, such as by probing the DIMM's contacts, are avoided.Type: GrantFiled: July 20, 2007Date of Patent: May 25, 2010Assignee: International Business Machines CorporationInventors: Moises Cases, Daniel N. de Araujo, Bradley D. Herrman, Erdem Matoglu, Bhyrav M. Mutnury, Pravin Patel, Nam H. Pham
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Publication number: 20100108350Abstract: Cables and methods of manufacturing cables for high speed data communications, the cable including: a first inner conductor enclosed by a first dielectric layer and a second inner conductor enclosed by a second dielectric layer, the inner conductors and the dielectric layers parallel with and along a longitudinal axis; and folded conductive shield material wrapped in a rotational direction along and about the longitudinal axis around the inner conductors and the dielectric layers, including overlapped wraps along and about the longitudinal axis, the conductive shield material comprising a first conductive layer and second conductive layer separated by an inner-shield dielectric layer.Type: ApplicationFiled: November 5, 2008Publication date: May 6, 2010Applicant: INTERNATIONAL BUSINESS MACHINES CORPORATIONInventors: Moises Cases, Daniel N. De Araujo, Bhyrav M. Mutnury, Bruce J. Wilkie
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Patent number: 7696787Abstract: A signal history controlled slew-rate transmission method and bus interface transmitter provide an improved channel equalization mechanism having low complexity. A variable slew-rate feed-forward pre-emphasis circuit changes the slew rate of the applied pre-emphasis in conformity with the history of the transmitted signal. The pre-emphasis circuit may be implemented by a pair of current sources supplying the output of the transmitter, and having differing current values. The current sources are controlled such that upon a signal value change, a high slew rate is provided and when the signal value does not change for two consecutive signal periods, the slew rate is reduced. A current source having a controlled magnitude may be employed to provide a slew rate that changes over time and is continuously reduced until another transmission value change occurs.Type: GrantFiled: December 21, 2007Date of Patent: April 13, 2010Assignee: International Business Machines CorporationInventors: Daniel N. De Araujo, Daniel M. Dreps, Bhyrav M. Mutnury
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Patent number: 7649142Abstract: A cable for high speed data communications and methods for manufacturing such cable are disclosed, the cable including a first inner conductor enclosed by a first dielectric layer and a second inner conductor enclosed by a second dielectric layer. The cable also includes conductive shield material wrapped in a rotational direction at a rate along and about the longitudinal axis around the inner conductors and the dielectric layers, including overlapped wraps of the conductive shield material along and about the longitudinal axis, the conductive shield material having a variable width. Transmitting signals on the cable including transmitting a balanced signal characterized by a frequency in the range of 7-9 gigahertz on the cable.Type: GrantFiled: March 17, 2009Date of Patent: January 19, 2010Assignee: International Business Machines CorporationInventors: Bruce R. Archambeault, Moises Cases, Samuel R. Connor, Daniel N. de Araujo, Bhyrav M. Mutnury
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Publication number: 20090166054Abstract: A cable for high speed data communications and methods for manufacturing such cable are disclosed, the cable including a first inner conductor enclosed by a first dielectric layer and a second inner conductor enclosed by a second dielectric layer. The cable also includes conductive shield material wrapped in a rotational direction at a rate along and about the longitudinal axis around the inner conductors and the dielectric layers, including overlapped wraps of the conductive shield material along and about the longitudinal axis, the conductive shield material having a variable width. Transmitting signals on the cable including transmitting a balanced signal characterized by a frequency in the range of 7-9 gigahertz on the cable.Type: ApplicationFiled: March 17, 2009Publication date: July 2, 2009Applicant: INTERNATIONAL BUSINESS MACHINES CORPORATIONInventors: Bruce R. Archambeault, Moises Cases, Samuel R. Connor, Daniel N. de Araujo, Bhyrav M. Mutnury
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Publication number: 20090168931Abstract: The present invention provides a simple, easy to implement method and apparatus to reduce jitter in a channel and expand the eye width and eye height of the eye pattern of the signal. The method and apparatus of the present invention reduces jitter specific to a channel in a high speed interface. The present invention utilizes a phasing shifting mechanism based on history of the incoming bits at the receiver. The input bits from the channel are shifted in time before getting to the receiver. This approach significantly reduces Intersymbol Interference (ISI) and deterministic jitter, thus opening up the eye width and eye height for a given interface.Type: ApplicationFiled: December 28, 2007Publication date: July 2, 2009Applicant: International Business Machines CorporationInventors: Moises Cases, Daniel N. de Araujo, Bhyrav M. Mutnury, Terence Rodrigues
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Publication number: 20090144256Abstract: Illustrative embodiments provide a computer implemented method, an apparatus and a computer program product for workflow management control in a resource hierarchy. In one embodiment, the computer implemented method comprises, receiving data, from a plurality of target data sources, into a collection, and synthesizing the received data in the collection to establish a resource hierarchy. The collection is then queried, using criteria in a request for a resource from a requester to provide a selected resource from the collection, forming a response, the selected resource of the response being a best fit result, and returning the response to the requester.Type: ApplicationFiled: November 29, 2007Publication date: June 4, 2009Inventors: Moises Cases, Candice Leontine Coletrane, Daniel N. de Araujo, Bhyrav Murthy Mutnury, William Gabriel Pagan
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Patent number: 7531749Abstract: A cable for high speed data communications and method of manufacturing the cable, the cable including a first inner conductor enclosed by a first dielectric layer and a second inner conductor enclosed by a second dielectric layer, the inner conductors and the dielectric layers twisted in a rotational direction at a periodic rate along and about a longitudinal axis and conductive shield material wrapped in the rotational direction at the periodic rate along and about the longitudinal axis around the inner conductors and the dielectric layers, including overlapped wraps at the periodic rate along and about the longitudinal axis. Transmitting signals on the cable including transmitting a balanced signal characterized by a frequency in the range of 7-9 gigahertz on the cable.Type: GrantFiled: June 12, 2007Date of Patent: May 12, 2009Assignee: International Business Machines CorporationInventors: Bruce R. Archambeault, Samuel R. Connor, Daniel N. de Araujo, Joseph C. Diepenbrock, Bhyrav M. Mutnury
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Patent number: 7525045Abstract: A cable for high speed data communications and methods for manufacturing such cable are disclosed, the cable including a first inner conductor enclosed by a first dielectric layer and a second inner conductor enclosed by a second dielectric layer. The cable also includes conductive shield material wrapped in a rotational direction at a rate along and about the longitudinal axis around the inner conductors and the dielectric layers, including overlapped wraps of the conductive shield material along and about the longitudinal axis, the conductive shield material having a variable width. Transmitting signals on the cable including transmitting a balanced signal characterized by a frequency in the range of 7-9 gigahertz on the cable.Type: GrantFiled: June 13, 2007Date of Patent: April 28, 2009Assignee: International Business Machines CorporationInventors: Bruce R. Archambeault, Moises Cases, Samuel R. Connor, Daniel N. de Araujo, Bhyrav M. Mutnury
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Publication number: 20090049339Abstract: A programmable diagnostic memory module provides enhanced testability of memory controller and memory subsystem design. The programmable diagnostic memory module includes an interface for communicating with an external diagnostic system, and the interface is used to transfer commands to the memory module to alter various behaviors of the memory module. The altered behaviors may be changing data streams that are written to the memory module to simulate errors, altering the timing and/or loading of the memory module signals, downloading programs for execution by a processor core within the memory module, changing driver strengths of output signals of the memory module, and manipulating in an analog domain, signals at terminals of the memory module such as injecting noise on power supply connections to the memory module. The memory module may emulate multiple selectable memory module types, and may include a complete storage array to provide standard memory module operation.Type: ApplicationFiled: August 17, 2007Publication date: February 19, 2009Inventors: Moises Cases, Daniel Mark Dreps, Bhyrav M. Mutnury, Nam H. Pham, Daniel N. De Araujo