Patents by Inventor Gilberto Medeiros Ribeiro

Gilberto Medeiros Ribeiro 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).

  • Publication number: 20130114329
    Abstract: A multilayer crossbar memory array includes a number of layers. Each layer includes a top set of parallel lines, a bottom set of parallel lines intersecting the top set of parallel lines, and memory elements disposed at intersections between the top set of parallel lines and the bottom set of parallel lines. A top set of parallel lines from one of the layers is a bottom set of parallel lines for an adjacent one of the layers.
    Type: Application
    Filed: August 30, 2010
    Publication date: May 9, 2013
    Inventors: Janice H. Nickel, Gilberto Medeiros Ribeiro, Jianhua Yang
  • Publication number: 20130106480
    Abstract: A metal-insulator transition (MIT) latch includes a first electrode spaced apart from a second electrode and an MIT material disposed between said first and second electrodes. The MIT material comprises a negative differential resistance (NDR) characteristic that exhibits a discontinuous resistance change at a threshold voltage or threshold current. Either the first or second electrode is electrically connected to an electrical bias source regulated to set a resistance phase of the MIT material.
    Type: Application
    Filed: January 31, 2012
    Publication date: May 2, 2013
    Inventors: Gilberto Medeiros Ribeiro, Matthew D. Pickett, R. Stanley Williams
  • Publication number: 20130106462
    Abstract: A field-programmable analog array (FPAA) includes a digital signal routing network, an analog signal routing network, switch elements to interconnect the digital signal routing network with the analog signal routing network, and a configurable analog block (CAB) connected to the analog signal routing network and having a programmable resistor array. The switch elements are implemented via digital memristors, the programmable resistor array is implemented via analog memristors, and/or antifuses within one or more of the digital signal routing network and the analog signal routing network are implemented via digital memristors.
    Type: Application
    Filed: October 26, 2011
    Publication date: May 2, 2013
    Inventors: Jianhua Yang, Muhammad Shakeel Qureshi, Gilberto Medeiros Ribeiro, R. Stanley Williams
  • Publication number: 20130099872
    Abstract: Chaotic oscillator-based random number generation is described. In an example, a circuit includes a negative differential resistance (NDR) device to receive an alternating current (AC) bias. The circuit further includes a capacitance in parallel with the NDR device, the capacitance having a value such that, in response to a direct current (DC) bias applied to the NDR device and the capacitance, a voltage across the capacitance oscillates with a chaotic period. The circuit further includes a random number generator to generate random numbers using samples of the voltage across the capacitance.
    Type: Application
    Filed: October 25, 2011
    Publication date: April 25, 2013
    Inventors: Matthew D. Pickett, Gilberto Medeiros Ribeiro, R. Stanley Williams
  • Publication number: 20130023106
    Abstract: A device (10) may include a semiconductor layer section (25) and a memory layer section (45) disposed above the semiconductor layer section (25). The semiconductor layer section (25) may include a processor (12; 412) and input/output block (16; 416), and the memory layer section (45) may include memristive memory (14; 300). A method of forming such device (10), and an apparatus (600) including such device (10) are also disclosed. Other embodiments are described and claimed.
    Type: Application
    Filed: March 12, 2010
    Publication date: January 24, 2013
    Inventors: Matthew D. Pickett, Jianhua Yang, Gilberto Medeiros Ribeiro
  • Publication number: 20120313070
    Abstract: A controlled switching memristor includes a first electrode, a second electrode, and a switching layer positioned between the first electrode and the second electrode. The switching layer includes a material to switch between an ON state and an OFF state, in which at least one of the first electrode, the second electrode, and the switching layer is to generate a permanent field within the memristor to enable a speed and an energy of switching from the ON state to the OFF state to be substantially symmetric to a speed and energy of switching from the OFF state to the ON state.
    Type: Application
    Filed: January 29, 2010
    Publication date: December 13, 2012
    Inventors: R. Stanley Williams, Gilberto Medeiros Ribeiro, Dmitri Borisovich Strukov, Jianhua Yang
  • Patent number: 8331131
    Abstract: A method of changing a state of a memristor having a first intermediate layer, a second intermediate layer, and a third intermediate layer positioned between a first electrode and a second electrode includes applying a first pulse having a first bias voltage across the memristor, wherein the first pulse causes mobile species to flow in a first direction within the memristor and collect in the first intermediate layer thereby causing the memristor to enter into an intermediate state and applying a second pulse having a second bias voltage across the memristor, in which the second pulse causes the mobile species from the first intermediate layer to flow in a second direction within the memristor and collect in the third intermediate layer, wherein the flow of the mobile species in the second direction causes the memristor to enter into a fully changed state.
    Type: Grant
    Filed: January 31, 2011
    Date of Patent: December 11, 2012
    Assignee: Hewlett-Packard Development Company, L.P.
    Inventors: Feng Miao, Jianhua Yang, Gilberto Medeiros Ribeiro, R. Stanley Williams
  • Patent number: 8324976
    Abstract: Circuitry is provided that closely emulates biological neural responses. Two astable multivibrator circuits (AMCs), each including a negative differential resistance device, are coupled in series-circuit relationship. Each AMC is characterized by a distinct voltage-dependant time constant. The circuitry exhibits oscillations in electrical current when subjected to a voltage equal to or greater than a threshold value. Various oscillating waveforms can be produced in accordance with voltages applied to the circuitry.
    Type: Grant
    Filed: April 1, 2011
    Date of Patent: December 4, 2012
    Assignee: Hewlett-Packard Development Company, L.P.
    Inventors: Julien Borghetti, Matthew D Pickett, Gilberto Medeiros Ribeiro, Wei Yi, Jianhua Yang, Minxian Max Zhang
  • Patent number: 8314475
    Abstract: One example of the present invention is a nanoscale electronic device comprising a first conductive electrode, a second conductive electrode, and an anisotropic dielectric material layered between the first and second electrodes having a permittivity in a direction approximately that of the shortest distance between the first and second electrodes less than the permittivity in other directions within the anisotropic dielectric material. Additional examples of the present invention include integrated circuits that contain multiple nanoscale electronic devices that each includes an anisotropic dielectric material layered between first and second electrodes having a permittivity in a direction approximately that of the shortest distance between the first and second electrodes less than the permittivity in other directions within the anisotropic dielectric material.
    Type: Grant
    Filed: November 9, 2010
    Date of Patent: November 20, 2012
    Assignee: Hewlett-Packard Development Company, L.P.
    Inventors: Gilberto Medeiros Ribeiro, Philip J. Kuekes, Alexandre M. Bratkovski, Janice H. Nickel
  • Publication number: 20120275211
    Abstract: A two-dimensional array of switching devices comprises a plurality of crossbar tiles. Each crossbar tile has a plurality of row wire segments intersecting a plurality of column wire segments, and a plurality of switching devices each formed at an intersection of a row wire segment and a column wire segment. The array has a plurality of lateral latches disposed in a plane of the switching devices. Each lateral latch is linked to a first wire segment of a first crossbar tile and a second wire segment of a second crossbar tile opposing the first wire segment. The lateral latch is operable to close or open to form or break an electric connection between the first and second wire segments.
    Type: Application
    Filed: April 30, 2011
    Publication date: November 1, 2012
    Inventors: Wei Yi, Gilberto Medeiros Ribeiro, R. Stanley Williams
  • Patent number: 8274813
    Abstract: A memristive Negative Differential Resistance (NDR) device includes a first electrode adjacent to a memristive matrix, the memristive matrix including an intrinsic semiconducting region and a highly doped secondary region, a Metal-Insulator-Transition (MIT) material in series with the memristive matrix, and a second electrode adjacent to the MIT material.
    Type: Grant
    Filed: July 16, 2010
    Date of Patent: September 25, 2012
    Assignee: Hewlett-Packard Development Company, L.P.
    Inventors: Matthew D. Pickett, Julien Borghetti, Gilberto Medeiros Ribeiro
  • Publication number: 20120228575
    Abstract: On example of the present invention is a nanoscale electronic device comprising a first conductive electrode, a second conductive electrode, and a device layer. The device layer comprises a first dielectric material, between the first and second conductive electrodes, that includes an effective device layer, a first barrier layer near a first interface between the first conductive electrode and the device layer, and a second barrier layer near a second interface between the second conductive electrode and the device layer. A second example of the present invention is an integrated circuit that incorporates nanoscale electronic devices of the first example.
    Type: Application
    Filed: March 7, 2011
    Publication date: September 13, 2012
    Inventors: Wei Yi, Jianhua Yang, Gilberto Medeiros Ribeiro
  • Patent number: 8264868
    Abstract: A memory array with Metal-Insulator Transition (MIT) switching devices includes a set of row lines intersecting a set of column lines and a memory element disposed at an intersection between one of the row lines and one of the column lines. The memory element includes a switching layer in series with an MIT material. A method of accessing a target memory element within a memory array includes applying half of an access voltage to a row line connected to the target memory element, the target memory element comprising a switching layer in series with an MIT material, and applying an inverted half of the access voltage to a column line connected to the target memory element.
    Type: Grant
    Filed: October 25, 2010
    Date of Patent: September 11, 2012
    Assignee: Hewlett-Packard Development Company, L.P.
    Inventors: Gilberto Medeiros Ribeiro, Matthew D. Pickett, Jianhua Yang
  • Publication number: 20120195099
    Abstract: A method of changing a state of a memristor having a first intermediate layer, a second intermediate layer, and a third intermediate layer positioned between a first electrode and a second electrode includes applying a first pulse having a first bias voltage across the memristor, wherein the first pulse causes mobile species to flow in a first direction within the memristor and collect in the first intermediate layer thereby causing the memristor to enter into an intermediate state and applying a second pulse having a second bias voltage across the memristor, in which the second pulse causes the mobile species from the first intermediate layer to flow in a second direction within the memristor and collect in the third intermediate layer, wherein the flow of the mobile species in the second direction causes the memristor to enter into a fully changed state.
    Type: Application
    Filed: January 31, 2011
    Publication date: August 2, 2012
    Inventors: Feng MIAO, Jianhua Yang, Gilberto Medeiros Ribeiro, R. Stanley Williams
  • Patent number: 8207520
    Abstract: A programmable crosspoint device with an integral diode includes a first crossbar, a second crossbar, a metallic interlayer, and a switching oxide layer interposed between the first crossbar and the metallic interlayer. The switching oxide layer has a low resistance state and high resistance state. The programmable crosspoint device also includes an integral diode which is interposed between the second crossbar layer and the metallic interlayer, the integral diode being configured to limit the flow of leakage current through the programmable crosspoint device in one direction. A method for forming a programmable crosspoint device with an integrated diode is also provided.
    Type: Grant
    Filed: April 2, 2010
    Date of Patent: June 26, 2012
    Assignee: Hewlett-Packard Development Company, L.P.
    Inventors: Jianhua Yang, Gilberto Medeiros Ribeiro, R Stanley Williams
  • Publication number: 20120146739
    Abstract: Methods and means related to an electronic circuit having an inductor and a memcapacitor are provided. Circuitry is formed upon a substrate such that an inductor and non-volatile memory capacitor are formed. Additional circuitry can be optionally formed on the substrate as well. The capacitive value of the memcapacitor is adjustable within a range by way of an applied programming voltage. The capacitive value of the memcapacitor is maintained until reprogrammed at some later time. Oscillators, phase-locked loops and other circuits can be configured using embodiments of the present teachings.
    Type: Application
    Filed: October 15, 2009
    Publication date: June 14, 2012
    Inventors: Gilberto Medeiros Ribeiro, John Paul Strachan
  • Publication number: 20120138885
    Abstract: An electrical circuit component includes a first electrode, a plurality of second electrodes and a negative differential resistance (NDR) material. The first electrode and the plurality of second electrodes are connected to the NDR material and the NDR material is to electrically connect the first electrode to one of the plurality of second electrodes when a sufficient voltage is applied between the first electrode and the one of the plurality of second electrodes through the NDR material.
    Type: Application
    Filed: December 6, 2010
    Publication date: June 7, 2012
    Inventors: Wei Wu, Matthew D. Pickett, Jianhua Yang, Qiangfei Xia, Gilberto Medeiros Ribeiro
  • Publication number: 20120105143
    Abstract: A programmable analog filter includes a crossbar array with a number of junction elements and a filter circuit being implemented within the crossbar array. At least a portion of the junction elements form reprogrammable components within the filter circuit. A method for using a programmable analog filter is also provided.
    Type: Application
    Filed: October 27, 2010
    Publication date: May 3, 2012
    Inventors: John Paul Strachan, Philip J. Kuekes, Gilberto Medeiros Ribeiro
  • Publication number: 20120104346
    Abstract: A semiconductor device for providing heat management may include a first electrode with low metal thermal conductivity and a second electrode with low metal thermal conductivity. A metal oxide structure which includes a transition metal oxide (TMO) may be electrically coupled to the first electrode and second electrode and the metal oxide structure may be disposed between the first electrode and second electrode. An electrically insulating sheath with low thermal conductivity may surround the metal oxide structure.
    Type: Application
    Filed: October 29, 2010
    Publication date: May 3, 2012
    Inventors: Wei Yi, Matthew D. Pickett, Gilberto Medeiros Ribeiro
  • Publication number: 20120099362
    Abstract: A memory array with Metal-Insulator Transition (MIT) switching devices includes a set of row lines intersecting a set of column lines and a memory element disposed at an intersection between one of the row lines and one of the column lines. The memory element includes a switching layer in series with an MIT material. A method of accessing a target memory element within a memory array includes applying half of an access voltage to a row line connected to the target memory element, the target memory element comprising a switching layer in series with an MIT material, and applying an inverted half of the access voltage to a column line connected to the target memory element.
    Type: Application
    Filed: October 25, 2010
    Publication date: April 26, 2012
    Inventors: Gilberto Medeiros Ribeiro, Matthew D. Pickett, Jianhua Yang