Patents by Inventor Andrew Lu

Andrew Lu 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: 7550303
    Abstract: Method for measuring misalignment between at least two layers of an integrated circuit. The method includes applying a current between a plurality of probe members in a first layer, wherein a first probe member and a second probe member of the plurality of probe members are substantially aligned along a first axis and partially overlap an overlay target in a second layer, measuring a voltage across the plurality of probe members wherein at least a voltage across the first probe member and a third probe member disposed perpendicular to the first axis and a voltage across the second probe member and the third probe member are measured, and determining an amount of misalignment between the first layer and the second layer along at least one of the first axis and the second axis based on the measuring steps.
    Type: Grant
    Filed: April 12, 2006
    Date of Patent: June 23, 2009
    Assignee: International Business Machines Corporation
    Inventors: Patricia Argandona, Faisal Azam, Andrew Lu, Helen Wang
  • Patent number: 7475368
    Abstract: A system, a method and a computer program product for analyzing a circuit design provide for discretizing the circuit design into a series of pixels. A fraction of at least one constituent material is determined for each pixel. A deflection is also determined for each pixel. The deflection is predicated upon a planarizing of the pixel, and it is calculated while utilizing an algorithm that includes the fraction of the at least one constituent material. A series of deflections for the series of pixels may be mapped and evaluated.
    Type: Grant
    Filed: January 20, 2006
    Date of Patent: January 6, 2009
    Assignee: International Business Machines Corporation
    Inventors: Matthew S. Angyal, Giovanni Fiorenza, Habib Hichri, Andrew Lu, Dale C. McHerron, Conal E. Murray
  • Publication number: 20070174796
    Abstract: A system, a method and a computer program product for analyzing a circuit design provide for discretizing the circuit design into a series of pixels. A fraction of at least one constituent material is determined for each pixel. A deflection is also determined for each pixel. The deflection is predicated upon a planarizing of the pixel, and it is calculated while utilizing an algorithm that includes the fraction of the at least one constituent material. A series of deflections for the series of pixels may be mapped and evaluated.
    Type: Application
    Filed: January 20, 2006
    Publication date: July 26, 2007
    Applicant: International Business Machines Corporation
    Inventors: Matthew Angyal, Giovanni Fiorenza, Habib Hichri, Andrew Lu, Dale McHerron, Conal Murray
  • Publication number: 20060175319
    Abstract: Method for measuring misalignment between at least two layers of an integrated circuit. The method includes applying a current between a plurality of probe members in a first layer, wherein a first probe member and a second probe member of the plurality of probe members are substantially aligned along a first axis and partially overlap an overlay target in a second layer, measuring a voltage across the plurality of probe members wherein at least a voltage across the first probe member and a third probe member disposed perpendicular to the first axis and a voltage across the second probe member and the third probe member are measured, and determining an amount of misalignment between the first layer and the second layer along at least one of the first axis and the second axis based on the measuring steps.
    Type: Application
    Filed: April 12, 2006
    Publication date: August 10, 2006
    Applicant: INTERNATIONAL BUSINESS MACHINES CORPORATION
    Inventors: Patricia ARGANDONA, Faisal AZAM, Andrew LU, Helen WANG
  • Patent number: 7084427
    Abstract: The systems and methods enable the determination of the magnitude and direction of overlay of at least two elements in two layers. Overlay measurements along two axes can be obtained using four probe pads and without requiring a decoder. Overlay measurements along a single axis can be obtained using three probe pads and without requiring a decoder. The systems and methods according to this invention require less space and are more time efficient than conventional measurement structures. In the systems and methods of this invention, offsets in a direction are calculated from resistance measurements.
    Type: Grant
    Filed: June 10, 2003
    Date of Patent: August 1, 2006
    Assignee: International Business Machines Corporation
    Inventors: Patricia Argandona, Faisal Azam, Andrew Lu, Helen Wang
  • Patent number: 6927472
    Abstract: A method and structure for a fuse structure comprises an insulator layer, a plurality of fuse electrodes extending through the insulator layer to an underlying wiring layer, an electroplated fuse element connected to the electrodes, and an interface wall. The fuse element is positioned external to the insulator, with a gap juxtaposed between the insulator and the fuse element. The interface wall further comprises a first side wall, a second side wall, and an inner wall, wherein the inner wall is disposed within the gap. The fuse electrodes are diametrically opposed to one another, and the fuse element is perpendicularly disposed above the fuse electrodes. The fuse element is either electroplatted, electroless plated, or is an ultra thin fuse.
    Type: Grant
    Filed: November 14, 2001
    Date of Patent: August 9, 2005
    Assignee: International Business Machines Corporation
    Inventors: David K. Anderson, Tien-Jen Cheng, Timothy J. Dalton, Christopher V. Jahnes, Andrew Lu, Chandrasekhar Narayan, Kevin S. Petrarca, Richard P. Volant, George F. Walker
  • Patent number: 6924185
    Abstract: A method and structure for a fuse structure comprises an insulator layer, a plurality of fuse electrodes extending through the insulator layer to an underlying wiring layer, an electroplated fuse element connected to the electrodes, and an interface wall. The fuse element is positioned external to the insulator, with a gap juxtaposed between the insulator and the fuse element. The interface wall further comprises a first side wall, a second side wall, and an inner wall, wherein the inner wall is disposed within the gap. The fuse electrodes are diametrically opposed to one another, and the fuse element is perpendicularly disposed above the fuse electrodes. The fuse element is either electroplatted, electroless plated, or is an ultra thin fuse.
    Type: Grant
    Filed: October 7, 2003
    Date of Patent: August 2, 2005
    Assignee: International Business Machines Corporation
    Inventors: David K. Anderson, Tien-Jen Cheng, Timothy J. Dalton, Christopher V. Jahnes, Andrew Lu, Chandrasekhar Narayan, Kevin S. Petrarca, Richard P. Volant, George F. Walker
  • Patent number: 6908830
    Abstract: A method of repeatedly exposing a pattern across a wafer in a sequential stepping process is disclosed. The pattern that is exposed includes at least one alignment mark. Each time the exposing process is repeated, the current exposure overlaps a portion of the wafer where the pattern was previously exposed and thereby erases a previously exposed alignment mark by re-exposing an area of the wafer where the previously exposed alignment mark was located. After the exposing process is repeated across the wafer, alignment marks remain only in the last exposed areas of the wafer.
    Type: Grant
    Filed: June 23, 2003
    Date of Patent: June 21, 2005
    Assignee: International Business Machines Corporation
    Inventors: Andrew Lu, Donald M. Odiwo, Roger J. Yerdon
  • Publication number: 20050019966
    Abstract: The systems and methods enable the determination of the magnitude and direction of overlay of at least two elements in two layers. Overlay measurements along two axes can be obtained using four probe pads and without requiring a decoder. Overlay measurements along a single axis can be obtained using three probe pads and without requiring a decoder. The systems and methods according to this invention require less space and are more time efficient than conventional measurement structures. In the systems and methods of this invention, offsets in a direction are calculated from resistance measurements.
    Type: Application
    Filed: June 10, 2003
    Publication date: January 27, 2005
    Applicant: INTERNATIONAL BUSINESS MACHINES CORPORATION
    Inventors: Patricia Argandona, Faisal Azam, Andrew Lu, Helen Wang
  • Publication number: 20040259322
    Abstract: A method of repeatedly exposing a pattern across a wafer in a sequential stepping process is disclosed. The pattern that is exposed includes at least one alignment mark. Each time the exposing process is repeated, the current exposure overlaps a portion of the wafer where the pattern was previously exposed and thereby erases a previously exposed alignment mark by re-exposing an area of the wafer where the previously exposed alignment mark was located. After the exposing process is repeated across the wafer, alignment marks remain only in the last exposed areas of the wafer.
    Type: Application
    Filed: June 23, 2003
    Publication date: December 23, 2004
    Applicant: International Business Machines Corporation
    Inventors: Andrew Lu, Donald M. Odiwo, Roger J. Yerdon
  • Patent number: 6803668
    Abstract: An alignment mark structure for use upon a semiconductor substrate is disclosed. In an exemplary embodiment, the alignment mark structure includes a plurality of segments arranged in an alignment pattern, with each of the plurality of segments being formed from a base pattern created on the substrate. The base pattern includes a plurality of sizes, wherein each of the plurality of sizes of the base pattern is repeated throughout an entire length of each of the plurality of segments.
    Type: Grant
    Filed: November 22, 2002
    Date of Patent: October 12, 2004
    Assignee: International Business Machines Corporation
    Inventors: Karen L. Holloway, Andrew Lu, Qiang Wu
  • Publication number: 20040099963
    Abstract: An alignment mark structure for use upon a semiconductor substrate is disclosed. In an exemplary embodiment, the alignment mark structure includes a plurality of segments arranged in an alignment pattern, with each of the plurality of segments being formed from a base pattern created on the substrate. The base pattern includes a plurality of sizes, wherein each of the plurality of sizes of the base pattern is repeated throughout an entire length of each of the plurality of segments.
    Type: Application
    Filed: November 22, 2002
    Publication date: May 27, 2004
    Applicant: INTERNATIONAL BUSINESS MACHINES CORPORATION
    Inventors: Karen L. Holloway, Andrew Lu, Qiang Wu
  • Publication number: 20040070049
    Abstract: A method and structure for a fuse structure comprises an insulator layer, a plurality of fuse electrodes extending through the insulator layer to an underlying wiring layer, an electroplated fuse element connected to the electrodes, and an interface wall. The fuse element is positioned external to the insulator, with a gap juxtaposed between the insulator and the fuse element. The interface wall further comprises a first side wall, a second side wall, and an inner wall, wherein the inner wall is disposed within the gap. The fuse electrodes are diametrically opposed to one another, and the fuse element is perpendicularly disposed above the fuse electrodes. The fuse element is either electroplatted, electroless plated, or is an ultra thin fuse.
    Type: Application
    Filed: October 7, 2003
    Publication date: April 15, 2004
    Inventors: David K. Anderson, Tien-Jen Cheng, Timothy J. Dalton, Christopher V. Jahnes, Andrew Lu, Chandrasekhar Narayan, Kevin S. Petrarca, Richard P. Volant, George F. Walker
  • Publication number: 20030089962
    Abstract: A method and structure for a fuse structure comprises an insulator layer, a plurality of fuse electrodes extending through the insulator layer to an underlying wiring layer, an electroplated fuse element connected to the electrodes, and an interface wall. The fuse element is positioned external to the insulator, with a gap juxtaposed between the insulator and the fuse element. The interface wall further comprises a first side wall, a second side wall, and an inner wall, wherein the inner wall is disposed within the gap. The fuse electrodes are diametrically opposed to one another, and the fuse element is perpendicularly disposed above the fuse electrodes. The fuse element is either electroplatted, electroless plated, or is an ultra thin fuse.
    Type: Application
    Filed: November 14, 2001
    Publication date: May 15, 2003
    Applicant: INTERNATIONAL BUSINESS MACHINES CORPORATION
    Inventors: David K. Anderson, Tien-Jen Cheng, Timothy J. Dalton, Christopher V. Jahnes, Andrew Lu, Chandrasekhar Narayan, Kevin S. Petrarca, Richard P. Volant, George F. Walker
  • Patent number: 6372647
    Abstract: A method of forming a dual damascene pattern in a dielectric, includes etching a pattern of lines minus vias overlapping the lines to a line depth, leaving the dielectric unetched at the via locations; while the vias are etched in a separate step, starting from the top surface of the dielectric and continuing to a via depth greater than the line depth.
    Type: Grant
    Filed: December 14, 1999
    Date of Patent: April 16, 2002
    Assignee: International Business Machines Corporation
    Inventors: Andrew Lu, Juan Alexander Chediak