Patents by Inventor Xuefeng Liu
Xuefeng Liu 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: 7138285Abstract: A method of performing quantum well intermixing in a semiconductor device structure uses a sacrificial part of a cap layer, that is removed after QWI processing, to restore the cap surface to a condition in which high performance contacts are still possible.Type: GrantFiled: May 21, 2003Date of Patent: November 21, 2006Assignee: Intense LimitedInventors: Stephen Najda, Stewart Duncan McDougall, Xuefeng Liu
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Publication number: 20060186983Abstract: An inductor formed on an integrated circuit chip including one or more inner layers between two or more outer layers, inductor metal winding turns included in one or more inner layers, and a magnetic material forming the two or more outer layers and the one or more inner layers. In one embodiment, the magnetic material is a photoresist paste having magnetic particles. In another embodiment, the magnetic material is a series of magnetic metallic strips disposed on each of first and second portions of the two or more outer layers and on each of the one or more inner layers. The series of magnetic metallic strips on the first and second portions form a grid pattern. Other embodiments include an adjustable controlled compound deposit and control windings with adjustable electrical currents.Type: ApplicationFiled: April 7, 2006Publication date: August 24, 2006Applicant: International Business Machines CorporationInventors: Hanyi Ding, Kai Feng, Zhong-Xiang He, Xuefeng Liu
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Publication number: 20060163688Abstract: A method of forming a semiconductor structure, comprising: providing a substrate having a buried insulative layer and a heavily doped layer; forming a first trench within the substrate around a protected area; filling the first trench with an insulative material, wherein the first trench filled with the insulative material and the buried insulative layer combine to form a high impedance noise isolation that surrounds the protected area on all sides except one side of the protected area to isolate noise from the protected area; forming a second trench within the substrate around the first trench; and filling the second trench with a conductive material, wherein the second trench filled with the conductive material and the heavily doped layer combine to form a low impedance ground path that surrounds the high impedance noise isolation on all sides except one side of the high impedance noise isolation to isolate noise from the protected area.Type: ApplicationFiled: January 27, 2005Publication date: July 27, 2006Applicant: INTERNATIONAL BUSINESS MACHINES CORPORATIONInventors: Hanyi Ding, Kai Feng, Zhong-Xiang He, Xuefeng Liu
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Publication number: 20060148106Abstract: A mixed-signal chip having a signal transformer located between analog circuitry and digital circuitry. The signal transformer includes a primary winding electrically coupled to the analog circuitry and a secondary winding electrically coupled to the digital circuitry. The primary and secondary windings are magnetically coupled with one another via a magnetic core. The magnetic coupling between the primary and secondary windings inhibits the coupling of electrical noise between the analog and digital circuitries.Type: ApplicationFiled: January 6, 2005Publication date: July 6, 2006Applicant: INTERNATIONAL BUSINESS MACHINES CORPORATIONInventors: Hanyi Ding, Kai Feng, Zhong-Xiang He, Xuefeng Liu
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Patent number: 7071530Abstract: A method of forming a semiconductor structure, comprising: providing a substrate having a buried insulative layer and a heavily doped layer; forming a first trench within the substrate around a protected area; filling the first trench with an insulative material, wherein the first trench filled with the insulative material and the buried insulative layer combine to form a high impedance noise isolation that surrounds the protected area on all sides except one side of the protected area to isolate noise from the protected area; forming a second trench within the substrate around the first trench; and filling the second trench with a conductive material, wherein the second trench filled with the conductive material and the heavily doped layer combine to form a low impedance ground path that surrounds the high impedance noise isolation on all sides except one side of the high impedance noise isolation to isolate noise from the protected area.Type: GrantFiled: January 27, 2005Date of Patent: July 4, 2006Assignee: International Business Machines CorporationInventors: Hanyi Ding, Kai D. Feng, Zhong-Xiang He, Xuefeng Liu
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Patent number: 7061359Abstract: An inductor formed on an integrated circuit chip including one or more inner layers (12) between two or more outer layers (14), inductor metal winding turns (16) included in one or more inner layers (12), and a magnetic material forming the two or more outer layers (14) and the one or more inner layers (12). In one embodiment, the magnetic material is a photoresist paste having magnetic particles. In another embodiment, the magnetic material is a series of magnetic metallic strips (32 and 36) disposed on each of the first and second portions (30 and 34, respectively) of the two or more outer layers (14) and on each of the one or more inner layers (12). The series of magnetic metallic strips on the first and second portions (30, 34) form a grid pattern. Other embodiments include an adjustable controlled compound deposit and control windings with adjustable electrical currents.Type: GrantFiled: June 30, 2003Date of Patent: June 13, 2006Assignee: International Business Machines CorporationInventors: Hanyi Ding, Kai Di Feng, Zhong-Xiang He, Xuefeng Liu
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Publication number: 20060060887Abstract: A heterojunction bipolar transistor is formed in a semiconductor substrate of a first conductivity type including a collector region. A base region is formed on the substrate and an emitter region is formed over the base region. At least one of the collector, base and emitter regions includes a first region doped with an impurity having a first concentration and a second region doped with the impurity having a second concentration. Noise performance and reliability of the heterojunction bipolar transistor is improved without degrading ac performance.Type: ApplicationFiled: September 21, 2004Publication date: March 23, 2006Applicant: INTERNATIONAL BUSINESS MACHINES CORPORATIONInventors: Peter Geiss, Alvin Joseph, Rajendran Krishnasamy, Xuefeng Liu
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Publication number: 20060057748Abstract: A method of performing quantum well intermixing in a semiconductor device structure uses a sacrificial part of a cap layer, that is removed after QWI processing, to restore the cap surface to a condition in which high performance contacts are still possible.Type: ApplicationFiled: May 21, 2003Publication date: March 16, 2006Inventors: Stephen Najda, Stewart McDougall, Xuefeng Liu
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Patent number: 6967167Abstract: A method for removing silicon dioxide residuals is disclosed. The method includes reacting a portion of a silicon dioxide layer (i.e., oxide) to form a reaction product layer, removing the reaction product layer and annealing in an environment to remove oxide residuals. The method finds application in a variety of semiconductor fabrication processes including, for example, fabrication of a vertical HBT or silicon-to-silicon interface without an oxide interface.Type: GrantFiled: September 30, 2003Date of Patent: November 22, 2005Assignee: International Business Machines CorporationInventors: Peter J. Geiss, Alvin J. Joseph, Xuefeng Liu, James S. Nakos, James J. Quinlivan
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Publication number: 20050070101Abstract: A method for removing silicon dioxide residuals is disclosed. The method includes reacting a portion of a silicon dioxide layer (i.e., oxide) to form a reaction product layer, removing the reaction product layer and annealing in an environment to remove oxide residuals. The method finds application in a variety of semiconductor fabrication processes including, for example, fabrication of a vertical HBT or silicon-to-silicon interface without an oxide interface.Type: ApplicationFiled: September 30, 2003Publication date: March 31, 2005Applicant: INTERNATIONAL BUSINESS MACHINES CORPORATIONInventors: Peter Geiss, Alvin Joseph, Xuefeng Liu, James Nakos, James Quinlivan
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Publication number: 20040263310Abstract: An inductor formed on an integrated circuit chip including one or more inner layers (12) between two or more outer layers (14), inductor metal winding turns (16) included in one or more inner layers (12), and a magnetic material forming the two or more outer layers (14) and the one or more inner layers (12). In one embodiment, the magnetic material is a photoresist paste having magnetic particles. In another embodiment, the magnetic material is a series of magnetic metallic strips (32 and 36) disposed on each of the first and second portions (30 and 34, respectively) of the two or more outer layers (14) and on each of the one or more inner layers (12). The series of magnetic metallic strips on the first and second portions (30, 34) form a grid pattern. Other embodiments include an adjustable controlled compound deposit and control windings with adjustable electrical currents.Type: ApplicationFiled: June 30, 2003Publication date: December 30, 2004Applicant: INTERNATIONAL BUSINESS MACHINES CORPORATIONInventors: Hanyi Ding, Kai Di Feng, Zhong-Xiang He, Xuefeng Liu
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Patent number: 6770127Abstract: An additive composition than can be incorporated into asphalt materials to impart thereto multigrade characteristics. The additive is prepared by reacting together at least one saponifiable organic acid, at least one resin acid, at least one unsaturated organic compound, and an alkali metal base to form a reaction product. Water produced during the reaction is removed as the reaction proceeds. The resulting reaction product can be formed into a powder and combined together with asphalt materials to produce multigrade asphalts.Type: GrantFiled: May 16, 2002Date of Patent: August 3, 2004Assignee: Shandong Heritage Highway Materials TechnologiesInventors: Anthony J. Kriech, Herbert L. Wissel, Haifang Zhou, Xuefeng Liu, Feng Xu
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Publication number: 20040140481Abstract: A high performance SiGe HBT that has a SiGe layer with a peak Ge concentration of at least approximately 20% and a boron-doped base region formed therein having a thickness. The base region includes diffusion-limiting impurities substantially throughout its thickness, at a peak concentration below that of boron in the base region. Both the base region and the diffusion-limiting impurities are positioned relative to a peak concentration of Ge in the SiGe layer so as to optimize both performance and yield.Type: ApplicationFiled: January 7, 2004Publication date: July 22, 2004Inventors: Basanth Jagannathan, Alvin J. Joseph, Xuefeng Liu, Kathryn T. Schonenberg, Ryan W. Wuthrich
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Patent number: 6744079Abstract: A high performance SiGe HBT that has a SiGe layer with a peak Ge concentration of at least approximately 20% and a boron-doped base region formed therein having a thickness. The base region includes diffusion-limiting impurities substantially throughout its thickness, at a peak concentration below that of boron in the base region. Both the base region and the diffusion-limiting impurities are positioned relative to a peak concentration of Ge in the SiGe layer so as to optimize both performance and yield.Type: GrantFiled: March 8, 2002Date of Patent: June 1, 2004Assignee: International Business Machines CorporationInventors: Basanth Jagannathan, Alvin J. Joseph, Xuefeng Liu, Kathryn T. Schonenberg, Ryan W. Wuthrich
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Patent number: 6719884Abstract: A method of manufacturing an optical device, wherein the device body portion from which the device is to be made includes at least one Quantum Well, the method including the step of causing an impurity material including copper to intermix with the Quantum Well.Type: GrantFiled: January 15, 2002Date of Patent: April 13, 2004Assignee: Intense Photonics LimitedInventors: John Haig Marsh, Craig James Hamilton, Olek Peter Kowalski, Stuart Duncan McDougall, Xuefeng Liu, Bo-Cang Qui
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Publication number: 20030213407Abstract: An additive composition than can be incorporated into asphalt materials to impart thereto multigrade characteristics. The additive is prepared by reacting together at least one saponifiable organic acid, at least one resin acid, at least one unsaturated organic compound, and an alkali metal base to form a reaction product. Water produced during the reaction is removed as the reaction proceeds. The resulting reaction product can be formed into a powder and combined together with asphalt materials to produce multigrade asphalts.Type: ApplicationFiled: May 16, 2002Publication date: November 20, 2003Inventors: Anthony J. Kriech, Herbert L. Wissel, Haifang Zhou, Xuefeng Liu, Feng Xu
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Publication number: 20030170960Abstract: A high performance SiGe HBT that has a SiGe layer with a peak Ge concentration of at least approximately 20% and a boron-doped base region formed therein having a thickness. The base region includes diffusion-limiting impurities substantially throughout its thickness, at a peak concentration below that of boron in the base region. Both the base region and the diffusion-limiting impurities are positioned relative to a peak concentration of Ge in the SiGe layer so as to optimize both performance and yield.Type: ApplicationFiled: March 8, 2002Publication date: September 11, 2003Applicant: International Business Machines CorporationInventors: Basanth Jagannathan, Alvin J. Joseph, Xuefeng Liu, Kathryn T. Schonenberg, Ryan W. Wuthrich
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Publication number: 20030053789Abstract: There is disclosed an improved method of manufacturing an optical device using impurity induced Quantum Well Intermixing (QWI) process.Type: ApplicationFiled: January 15, 2002Publication date: March 20, 2003Applicant: The University Court of the University of GlasgowInventors: John Haig Marsh, Craig James Hamilton, Olek Peter Kowalski, Stuart Duncan McDougall, Xuefeng Liu, Bo-Cang Qui