Patents by Inventor Louis L. C. Hsu

Louis L. C. Hsu 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: 8687445
    Abstract: A method for repairing degraded field effect transistors includes forward biasing PN junctions of one of a source and a drain of a field effect transistor (FET), and a body of the FET. Charge is injected from a substrate to a gate region to neutralize charge in the gate region. The method is applicable to CMOS devices. Repair circuits are disclosed for implementing the repairs.
    Type: Grant
    Filed: March 18, 2013
    Date of Patent: April 1, 2014
    Assignee: International Business Machines Corporation
    Inventors: Louis L. C. Hsu, Rajiv V. Joshi, Zhijian J. Yang, Ping-Chuan Wang
  • Patent number: 8422322
    Abstract: A method for repairing degraded field effect transistors includes forward biasing PN junctions of one of a source and a drain of a field effect transistor (FET), and a body of the FET. Charge is injected from a substrate to a gate region to neutralize charge in the gate region. The method is applicable to CMOS devices. Repair circuits are disclosed for implementing the repairs.
    Type: Grant
    Filed: November 3, 2011
    Date of Patent: April 16, 2013
    Assignee: International Business Machines Corporation
    Inventors: Louis L. C. Hsu, Rajiv V. Joshi, Zhijian J. Yang, Ping-Chuan Wang
  • Publication number: 20120051166
    Abstract: A method for repairing degraded field effect transistors includes forward biasing PN junctions of one of a source and a drain of a field effect transistor (FET), and a body of the FET. Charge is injected from a substrate to a gate region to neutralize charge in the gate region. The method is applicable to CMOS devices. Repair circuits are disclosed for implementing the repairs.
    Type: Application
    Filed: November 3, 2011
    Publication date: March 1, 2012
    Applicant: INTERNATIONAL BUSINESS MACHINES CORPORATION
    Inventors: Louis L. C. Hsu, Rajiv V. Joshi, Zhijian J. Yang, Ping-Chuan Wang
  • Patent number: 8098536
    Abstract: A method for repairing degraded field effect transistors includes forward biasing PN junctions of one of a source and a drain of a field effect transistor (FET), and a body of the FET. Charge is injected from a substrate to a gate region to neutralize charge in the gate region. The method is applicable to CMOS devices. Repair circuits are disclosed for implementing the repairs.
    Type: Grant
    Filed: January 24, 2008
    Date of Patent: January 17, 2012
    Assignee: International Business Machines Corporation
    Inventors: Louis L. C. Hsu, Rajiv V. Joshi, Zhijian J. Yang, Ping-Chuan Wang
  • Patent number: 8023305
    Abstract: A magnetic domain wall memory apparatus with write/read capability includes a plurality of coplanar shift register structures each comprising an elongated track formed from a ferromagnetic material having a plurality of magnetic domains therein, the shift register structures further having a plurality of discontinuities therein to facilitate domain wall location; a magnetic read element associated with each of the shift register structures; and a magnetic write element associated with each of the shift register structures, the magnetic write element further comprising a single write wire having a longitudinal axis substantially orthogonal to a longitudinal axis of each of the coplanar shift register structures.
    Type: Grant
    Filed: June 10, 2008
    Date of Patent: September 20, 2011
    Assignee: International Business Machines Corporation
    Inventors: Michael C. Gaidis, Lawrence A. Clevenger, Timothy J. Dalton, John K. DeBrosse, Louis L. C. Hsu, Carl Radens, Keith Kwong-Hon Wong, Chih-Chao Yang
  • Patent number: 8009453
    Abstract: A magnetic domain wall memory apparatus with write/read capability includes a plurality of coplanar shift register structures each comprising an elongated track formed from a ferromagnetic material having a plurality of magnetic domains therein, the shift register structures further having a plurality of discontinuities therein to facilitate domain wall location; a magnetic read element associated with each of the shift register structures; and a magnetic write element associated with each of the shift register structures, the magnetic write element further comprising a write wire having a constriction therein, the constriction located at a point corresponding to the location of the plurality of discontinuities in the associated shift register structure.
    Type: Grant
    Filed: June 10, 2008
    Date of Patent: August 30, 2011
    Assignee: International Business Machines Corporation
    Inventors: Michael C. Gaidis, Lawrence A. Clevenger, Timothy J. Dalton, John K. DeBrosse, Louis L. C. Hsu, Carl Radens, Keith Kwong-Hon Wong, Chih-Chao Yang
  • Patent number: 7983069
    Abstract: Improved write operation techniques for use in phase-change-material (PCM) memory devices are disclosed. By way of one example, a method of performing a write operation in a phase-change-material memory cell, the memory cell having a set phase and a reset phase associated therewith, comprises the following steps. A word-line associated with the memory cell is monitored. Performance of a write operation to the memory cell for the set phase is initiated when the word-line is activated. The write operation to the memory cell for the set phase may then be continued when valid data for the set phase is available. A write operation to the memory cell for the reset phase may be performed when valid data for the reset phase is available. Other improved PCM write operation techniques are disclosed.
    Type: Grant
    Filed: June 25, 2008
    Date of Patent: July 19, 2011
    Assignee: International Business Machines Corporation
    Inventors: Louis L. C. Hsu, Brian L. Ji, Chung Hon Lam
  • Patent number: 7838873
    Abstract: A method of forming a stochastically based integrated circuit encryption structure includes forming a lower conductive layer over a substrate, forming a short prevention layer over the lower conductive layer, forming an intermediate layer over the short prevention layer, wherein the intermediate layer is characterized by randomly structured nanopore features. An upper conductive layer is formed over the random nanopore structured intermediate layer. The upper conductive layer is patterned into an array of individual cells, wherein a measurable electrical parameter of the individual cells has a random distribution from cell to cell with respect to a reference value of the electrical parameter.
    Type: Grant
    Filed: August 18, 2008
    Date of Patent: November 23, 2010
    Assignee: International Business Machines Corporation
    Inventors: Lawrence A. Clevenger, Matthew E. Colburn, Timothy J. Dalton, Michael C. Gaidis, Louis L. C. Hsu, Carl Radens, Keith Kwong Hon Wong, Chih-Chao Yang
  • Patent number: 7825420
    Abstract: A magnetic random access memory (MRAM) device includes a magnetic tunnel junction (MTJ) stack formed over a lower wiring level, a hardmask formed on the MTJ stack, and an upper wiring level formed over the hardmask. The upper wiring level includes a slot via bitline formed therein, the slot via bitline in contact with the hardmask and in contact with an etch stop layer partially surrounding sidewalls of the hardmask.
    Type: Grant
    Filed: August 12, 2009
    Date of Patent: November 2, 2010
    Assignee: International Business Machines Corporation
    Inventors: Michael C. Gaidis, Carl Radens, Lawrence A. Clevenger, Timothy J. Dalton, Louis L. C. Hsu, Keith Kwong Hon Wong, Chih-Chao Yang
  • Patent number: 7749778
    Abstract: A method of monitoring and testing electro-migration and time dependent dielectric breakdown includes forming an addressable wiring test array, which includes a plurality or horizontally disposed metal wiring and a plurality of segmented, vertically disposed probing wiring, performing a single row continuity/resistance check to determine which row of said metal wiring is open, performing a full serpentine continuity/resistance check, and determining a position of short defects.
    Type: Grant
    Filed: January 3, 2007
    Date of Patent: July 6, 2010
    Assignee: International Business Machines Corporation
    Inventors: Kaushik Chanda, Lawrence Clevenger, Timothy J. Dalton, Louis L. C. Hsu, Chih-Chao Yang
  • Patent number: 7635884
    Abstract: A magnetic random access memory (MRAM) device includes a magnetic tunnel junction (MTJ) stack formed over a lower wiring level, a hardmask formed on the MTJ stack, and an upper wiring level formed over the hardmask. The upper wiring level includes a slot via bitline formed therein, the slot via bitline in contact with the hardmask and in contact with an etch stop layer partially surrounding sidewalls of the hardmask.
    Type: Grant
    Filed: July 29, 2005
    Date of Patent: December 22, 2009
    Assignee: International Business Machines Corporation
    Inventors: Michael C. Gaidis, Carl Radens, Lawrence A. Clevenger, Timothy J. Dalton, Louis L. C. Hsu, Keith Kwong Hon Wong, Chih-Chao Yang
  • Publication number: 20090302405
    Abstract: A magnetic random access memory (MRAM) device includes a magnetic tunnel junction (MTJ) stack formed over a lower wiring level, a hardmask formed on the MTJ stack, and an upper wiring level formed over the hardmask. The upper wiring level includes a slot via bitline formed therein, the slot via bitline in contact with the hardmask and in contact with an etch stop layer partially surrounding sidewalls of the hardmask.
    Type: Application
    Filed: August 12, 2009
    Publication date: December 10, 2009
    Applicant: INTERNATIONAL BUSINESS MACHINES CORPORATION
    Inventors: Michael C. Gaidis, Carl Radens, Lawrence A. Clevenger, Timothy J. Dalton, Louis L. C. Hsu, Keith Kwong Hon Wong, Chih-Chao Yang
  • Publication number: 20090190413
    Abstract: A method for repairing degraded field effect transistors includes forward biasing PN junctions of one of a source and a drain of a field effect transistor (FET), and a body of the FET. Charge is injected from a substrate to a gate region to neutralize charge in the gate region. The method is applicable to CMOS devices. Repair circuits are disclosed for implementing the repairs.
    Type: Application
    Filed: January 24, 2008
    Publication date: July 30, 2009
    Inventors: Louis L. C. Hsu, Rajiv V. Joshi, Zhijian J. Yang, Ping-Chuan Wang
  • Patent number: 7560310
    Abstract: A method of fabricating a semiconductor device includes etching a substrate formed on a backside of a semiconductor wafer to form a recess in the substrate, and forming a sputter film in the recess, the sputter film including a first material having a coefficient of thermal expansion (CTE) which is at least substantially equal to a CTE of the substrate, and a second material having a thermal conductivity which is greater than a thermal conductivity of the substrate.
    Type: Grant
    Filed: December 27, 2007
    Date of Patent: July 14, 2009
    Assignee: International Business Machines Corporation
    Inventors: Louis L. C. Hsu, Rajiv V. Joshi, Jack Allan Mandelman
  • Patent number: 7544578
    Abstract: A method of forming a stochastically based integrated circuit encryption structure includes forming a lower conductive layer over a substrate, forming a short prevention layer over the lower conductive layer, forming an intermediate layer over the short prevention layer, wherein the intermediate layer is characterized by randomly structured nanopore features. An upper conductive layer is formed over the random nanopore structured intermediate layer. The upper conductive layer is patterned into an array of individual cells, wherein a measurable electrical parameter of the individual cells has a random distribution from cell to cell with respect to a reference value of the electrical parameter.
    Type: Grant
    Filed: January 3, 2007
    Date of Patent: June 9, 2009
    Assignee: International Business Machines Corporation
    Inventors: Lawrence A. Clevenger, Matthew E. Colburn, Timothy J. Dalton, Michael C. Gaidis, Louis L. C. Hsu, Carl Radens, Keith Kwong Hon Wong, Chih-Chao Yang
  • Patent number: 7514271
    Abstract: A method of forming a magnetic domain wall memory apparatus with write/read capability includes forming a plurality of coplanar shift register structures each comprising an elongated track formed from a ferromagnetic material having a plurality of magnetic domains therein, the shift register structures further having a plurality of discontinuities therein to facilitate domain wall location: forming a magnetic read element associated with each of the shift register structures: and forming a magnetic write element associated with each of the shift register structures, the magnetic write element further comprising a write wire having a constriction therein, the constriction located at a point corresponding to the location of one of the plurality of discontinuities in the associated shift register structure.
    Type: Grant
    Filed: March 30, 2007
    Date of Patent: April 7, 2009
    Assignee: International Business Machines Corporation
    Inventors: Michael C. Gaidis, Lawrence A. Clevenger, Timothy J. Dalton, John K. DeBrosse, Louis L. C. Hsu, Carl Radens, Keith Kwong-Hon Wong, Chih-Chao Yang
  • Publication number: 20080308801
    Abstract: A method of forming a stochastically based integrated circuit encryption structure includes forming a lower conductive layer over a substrate, forming a short prevention layer over the lower conductive layer, forming an intermediate layer over the short prevention layer, wherein the intermediate layer is characterized by randomly structured nanopore features. An upper conductive layer is formed over the random nanopore structured intermediate layer. The upper conductive layer is patterned into an array of individual cells, wherein a measurable electrical parameter of the individual cells has a random distribution from cell to cell with respect to a reference value of the electrical parameter.
    Type: Application
    Filed: August 18, 2008
    Publication date: December 18, 2008
    Applicant: INTERNATIONAL BUSINESS MACHINES CORPORATION
    Inventors: Lawrence A. Clevenger, Matthew E. Colburn, Timothy J. Dalton, Michael C. Gaidis, Louis L. C. Hsu, Carl Radens, Keith Kwong Hon Wong, Chih-Chao Yang
  • Patent number: 7460389
    Abstract: Improved write operation techniques for use in phase-change-material (PCM) memory devices are disclosed. By way of one example, a method of performing a write operation in a phase-change-material memory cell, the memory cell having a set phase and a reset phase associated therewith, comprises the following steps. A word-line associated with the memory cell is monitored. Performance of a write operation to the memory cell for the set phase is initiated when the word-line is activated. The write operation to the memory cell for the set phase may then be continued when valid data for the set phase is available. A write operation to the memory cell for the reset phase may be performed when valid data for the reset phase is available. Other improved PCM write operation techniques are disclosed.
    Type: Grant
    Filed: July 29, 2005
    Date of Patent: December 2, 2008
    Assignee: International Business Machines Corporation
    Inventors: Louis L. C. Hsu, Brian L. Ji, Chung Hon Lam
  • Publication number: 20080253177
    Abstract: Improved write operation techniques for use in phase-change-material (PCM) memory devices are disclosed. By way of one example, a method of performing a write operation in a phase-change-material memory cell, the memory cell having a set phase and a reset phase associated therewith, comprises the following steps. A word-line associated with the memory cell is monitored. Performance of a write operation to the memory cell for the set phase is initiated when the word-line is activated. The write operation to the memory cell for the set phase may then be continued when valid data for the set phase is available. A write operation to the memory cell for the reset phase may be performed when valid data for the reset phase is available. Other improved PCM write operation techniques are disclosed.
    Type: Application
    Filed: June 25, 2008
    Publication date: October 16, 2008
    Applicant: International Business Machines Corporation
    Inventors: Louis L.C. Hsu, Brian L. Ji, Chung Hon Lam
  • Publication number: 20080239785
    Abstract: A magnetic domain wall memory apparatus with write/read capability includes a plurality of coplanar shift register structures each comprising an elongated track formed from a ferromagnetic material having a plurality of magnetic domains therein, the shift register structures further having a plurality of discontinuities therein to facilitate domain wall location; a magnetic read element associated with each of the shift register structures; and a magnetic write element associated with each of the shift register structures, the magnetic write element further comprising a write wire having a constriction therein, the constriction located at a point corresponding to the location of the plurality of discontinuities in the associated shift register structure.
    Type: Application
    Filed: June 10, 2008
    Publication date: October 2, 2008
    Applicant: INTERNATIONAL BUSINESS MACHINES CORPORATION
    Inventors: Michael C. Gaidis, Lawrence A. Clevenger, Timothy J. Dalton, John K. DeBrosse, Louis L.C. Hsu, Carl Radens, Keith Kwong Hon Wong, Chih-Chao Yang