Patents by Inventor Xiao Luo

Xiao Luo 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).

  • Patent number: 7623369
    Abstract: A method and system for providing a magnetic memory is described. The method and system include providing magnetic memory cells, local and global word lines, bit lines, and source lines. Each magnetic memory cell includes a magnetic element and a selection device connected with the magnetic element. The magnetic element is programed by first and second write currents driven through the magnetic element in first and second directions. The local word lines are connected with the selection device of and have a first resistivity. Each global word line corresponds to a portion of the local word lines and has a resistivity lower than the first resistivity. The bit lines are connected with the magnetic element. The source lines are connected with the selection device. Each source line corresponds to a more than one of the magnetic memory cells and carries the first and second write currents.
    Type: Grant
    Filed: February 13, 2008
    Date of Patent: November 24, 2009
    Assignees: Grandis, Inc., Renesas Technology Corp.
    Inventors: Xiao Luo, Eugene Chen, Lien-Chang Wang, Yiming Huai
  • Publication number: 20090040855
    Abstract: A method and system for providing a magnetic memory are described. The method and system include a plurality of magnetic storage cells, a plurality of bit lines, at least one reference line, and at least one sense amplifier. Each magnetic storage cell includes magnetic element(s) and selection device(s). The magnetic element(s) are programmable using write current(s) driven through the magnetic element. The bit and source lines correspond to the magnetic storage cells. The sense amplifier(s) are coupled with the bit lines and reference line(s), and include logic and a plurality of stages. The stages include first and second stages. The first stage converts at least current signal to at least one differential voltage signal. The second stage amplifies the at least one differential voltage signal. The logic selectively disablies at least one of the first and second stages in the absence of a read operation and enabling the first and second stages during the read operation.
    Type: Application
    Filed: August 7, 2007
    Publication date: February 12, 2009
    Applicants: GRANDIS, INC., RENESAS TECHNOLOGY CORP.
    Inventors: Xiao Luo, David Chang-Cheng Yu
  • Patent number: 7486572
    Abstract: A voltage regulator for a static random access memory operating either in a standby mode or a operation mode is provided. The voltage regulator includes a reference voltage generating circuit for generating a reference voltage, a first control circuit connected to the reference voltage generating circuit for providing power supply during the standby mode of the SRAM, and a second control circuit connected to the reference voltage generating circuit for providing power in response to an enabling signal during the operation mode of the SRAM.
    Type: Grant
    Filed: June 14, 2006
    Date of Patent: February 3, 2009
    Assignee: Brilliance Semiconductor Intl. Inc.
    Inventors: Xiao Luo, Tsung-Lu Syu
  • Publication number: 20080151611
    Abstract: A method and system for providing a magnetic memory is described. The method and system include providing magnetic memory cells, local and global word lines, bit lines, and source lines. Each magnetic memory cell includes a magnetic element and a selection device connected with the magnetic element. The magnetic element is programmed by first and second write currents driven through the magnetic element in first and second directions. The local word lines are connected with the selection device of and have a first resistivity. Each global word line corresponds to a portion of the local word lines and has a resistivity lower than the first resistivity. The bit lines are connected with the magnetic element. The source lines are connected with the selection device. Each source line corresponds to a more than one of the magnetic memory cells and carries the first and second write currents.
    Type: Application
    Filed: February 13, 2008
    Publication date: June 26, 2008
    Applicants: GRANDIS, INC., RENESAS TECHNOLOGY CORP.
    Inventors: Xiao Luo, Eugene Youjun Chen, Lien-Chang Wang, Yiming Huai
  • Patent number: 7379327
    Abstract: A method and system for providing a magnetic memory. The magnetic memory includes magnetic storage cells in an array, bit lines, and source lines. Each magnetic storage cell includes at least one magnetic element. The magnetic element(s) are programmable by write currents driven through the magnetic element(s). Each magnetic element has free and pinned layer(s) and a dominant spacer.
    Type: Grant
    Filed: June 26, 2006
    Date of Patent: May 27, 2008
    Assignees: Grandis, Inc., Renesas Technology Corp.
    Inventors: Eugene Youjun Chen, Yiming Huai, Alex Fischer Panchula, Lien-Chang Wang, Xiao Luo
  • Patent number: 7345912
    Abstract: A method and system for providing a magnetic memory is described. The method and system include providing magnetic memory cells, local and global word lines, bit lines, and source lines. Each magnetic memory cell includes a magnetic element and a selection device connected with the magnetic element. The magnetic element is programmed by first and second write currents driven through the magnetic element in first and second directions. The local word lines are connected with the selection device of and have a first resistivity. Each global word line corresponds to a portion of the local word lines and has a resistivity lower than the first resistivity. The bit lines are connected with the magnetic element. The source lines are connected with the selection device. Each source line corresponds to a more than one of the magnetic memory cells and carries the first and second write currents.
    Type: Grant
    Filed: June 1, 2006
    Date of Patent: March 18, 2008
    Assignees: Grandis, Inc., Renesas Technology Corp.
    Inventors: Xiao Luo, Eugene Youjun Chen, Lien-Chang Wang, Yiming Huai
  • Publication number: 20070297223
    Abstract: A method and system for providing a magnetic memory is described. The magnetic memory includes magnetic storage cells in an array, bit lines, and source lines. Each magnetic storage cell includes at least one magnetic element. The magnetic element(s) are programmable by write currents driven through the magnetic element(s). Each magnetic element has free and pinned layer(s) and a dominant spacer.
    Type: Application
    Filed: June 26, 2006
    Publication date: December 27, 2007
    Inventors: Eugene Youjun Chen, Yiming Huai, Alex Fischer Panchula, Lien-Chang Wang, Xiao Luo
  • Publication number: 20070279968
    Abstract: A method and system for providing a magnetic memory is described. The method and system include providing magnetic memory cells, local and global word lines, bit lines, and source lines. Each magnetic memory cell includes a magnetic element and a selection device connected with the magnetic element. The magnetic element is programmed by first and second write currents driven through the magnetic element in first and second directions. The local word lines are connected with the selection device of and have a first resistivity. Each global word line corresponds to a portion of the local word lines and has a resistivity lower than the first resistivity. The bit lines are connected with the magnetic element. The source lines are connected with the selection device. Each source line corresponds to a more than one of the magnetic memory cells and carries the first and second write currents.
    Type: Application
    Filed: June 1, 2006
    Publication date: December 6, 2007
    Inventors: Xiao Luo, Eugene Youjun Chen, Lien-Chang Wang, Yiming Huai
  • Publication number: 20070279967
    Abstract: A method and system for providing and using a magnetic storage cell and magnetic memory is described. The method and system include providing a magnetic element and providing a selection device. The magnetic element is programmable to a first state by a first write current driven through the magnetic element in a first direction and to a second state by a second write current driven through the magnetic element in a second direction. The selection device is connected with the magnetic element. The selection device includes a gate having an aperture therein. The selection device is configured such that the first write current and second write current are provided to the magnetic element across the aperture.
    Type: Application
    Filed: May 18, 2006
    Publication date: December 6, 2007
    Inventors: Xiao Luo, Lien-Chang Wang
  • Publication number: 20070070718
    Abstract: A voltage regulator for a static random access memory operating either in a standby mode or a operation mode is provided. The voltage regulator includes a reference voltage generating circuit for generating a reference voltage, a first control circuit connected to the reference voltage generating circuit for providing power supply during the standby mode of the SRAM, and a second control circuit connected to the reference voltage generating circuit for providing power in response to an enabling signal during the operation mode of the SRAM.
    Type: Application
    Filed: June 14, 2006
    Publication date: March 29, 2007
    Inventors: Xiao Luo, Tsung-Lu Syu
  • Publication number: 20050271326
    Abstract: Optical transmission structures include a waveguide and an optical lens wherein the optical lens has a sufficiently large thickness to allow the formation of a curved front lens surface that collimates transmitted light rays so that they travel within a plane that is coplanar to a working surface. The present invention also relates to a technique for manufacturing the optical transmission structure, which involves the use of a photopolymer material. The optical transmission structure can be implemented in various systems such as a system for optical data input.
    Type: Application
    Filed: June 4, 2004
    Publication date: December 8, 2005
    Inventor: Xiao Luo
  • Publication number: 20020041196
    Abstract: A delay locked loop based clocking circuit includes a lead delay line followed by a period delay line. The lead delay line receives an input clock signal and includes an analog delay control input. The period delay line has a plurality of taps and an analog delay control input, and is operated such that the N taps divide a single period of an input clock. A selected tap of the period delay line, sometimes called a “virtual zero-degree tap,” is fed back and phase-compared with the input clock signal to adjust the delay of the lead delay line.
    Type: Application
    Filed: July 17, 2001
    Publication date: April 11, 2002
    Inventors: Paul Demone, Joerg Stender, Jamal Benzreba, Bruce Millar, Xiao Luo
  • Patent number: 6134153
    Abstract: A bi-directional global data bus scheme for use in a random access memory which optimizes the performance of the data path for read and write operations while offering a uniform read and write frequency to the external processor or controller is presented. The system makes use of a dual local data bus structure which allows the column address to change on every clock cycle since the two parallel local data paths are activated on alternate clock cycles and therefore operate at half the nominal operating frequency. For the read operation, the global data buses operate differentially at the nominal operating frequency. For the write operation, the global data buses operate at half the nominal operating frequency with each global data bus of a complementary data bus pair being dedicated to either one or the other local data paths for every other clock cycle.
    Type: Grant
    Filed: July 29, 1999
    Date of Patent: October 17, 2000
    Assignees: Mosaid Technologies Incorporated, Oki Electric Industry Co. Ltd.
    Inventors: Valerie Lines, Cynthia Mar, Xiao Luo, Sampei Miyamoto
  • Patent number: 5982674
    Abstract: A bi-directional global data bus scheme for use in a random access memory which optimizes the performance of the data path for read and write operations while offering a uniform read and write frequency to the external processor or controller is presented. The system makes use of a dual local data bus structure which allows the column address to change on every clock cycle since the two parallel local data paths are activated on alternate clock cycles and therefore operate at half the nominal operating frequency. For the read operation, the global data buses operate differentially at the nominal operating frequency. For the write operation, the global data buses operate at half the nominal operating frequency with each global data bus of a complementary data bus pair being dedicated to either one or the other local data paths for every other clock cycle.
    Type: Grant
    Filed: September 30, 1998
    Date of Patent: November 9, 1999
    Assignees: Mosaid Technologies Incorporated, Oki Electric Industry Co. Ltd.
    Inventors: Valeria Lines, Cynthia Mar, Xiao Luo, Sampei Miyamoto