Patents by Inventor Pradeep Ramachandramurthy Yelehanka

Pradeep Ramachandramurthy Yelehanka 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: 20080032513
    Abstract: An integrated circuit system including loading a wafer into a processing chamber and pre-purging the processing chamber with a first ammonia gas. Depositing a first nitride layer over the wafer and purging the processing chamber with a second ammonia gas. Depositing a second nitride layer over the first nitride layer that is misaligned with the first nitride layer. Post-purging the processing chamber with a third ammonia gas and purging the processing chamber with a nitrogen gas.
    Type: Application
    Filed: July 5, 2006
    Publication date: February 7, 2008
    Applicant: CHARTERED SEMICONDUCTOR MANUFACTURING LTD.
    Inventors: Sripad Sheshagiri Nagarad, Hwa Weng Koh, Dong Kyun Sohn, Xiaoyu Chen, Louis Lim, Sung Mun Jung, Chiew Wah Yap, Pradeep Ramachandramurthy Yelehanka, Nitin Kamat
  • Patent number: 7183590
    Abstract: An integrated circuit structure includes providing a semiconductor substrate and forming a trench therein. A thyristor is formed around the trench and within the semiconductor substrate. The thyristor has at least four layers with three P-N junctions therebetween. A gate for the thyristor is formed within the trench. An access transistor is formed on the semiconductor substrate. An interconnect is formed between the thyristor and the access transistor.
    Type: Grant
    Filed: June 6, 2006
    Date of Patent: February 27, 2007
    Assignee: Chartered Semiconductor Manufacturing Ltd.
    Inventors: Jia Zhen Zheng, Weining Li, Tze Ho Simon Chan, Pradeep Ramachandramurthy Yelehanka
  • Patent number: 7148522
    Abstract: An integrated circuit structure includes a semiconductor substrate and a thyristor formed thereon. The thyristor has at least four layers, with three P-N junctions therebetween. At least two of the layers are formed horizontally and at least two of the layers are formed vertically. A gate is formed adjacent at least one of the vertically formed layers. An access transistor is formed on the semiconductor substrate, and an interconnect is formed between the thyristor and the access transistor.
    Type: Grant
    Filed: December 11, 2004
    Date of Patent: December 12, 2006
    Assignee: Chartered Semiconductor Manufacturing Ltd.
    Inventors: Elgin Quek, Pradeep Ramachandramurthy Yelehanka, Jia Zhen Zheng, Tommy Lai, Weining Li
  • Patent number: 7119005
    Abstract: An integrated circuit is provided. A gate dielectric and a gate are provided respectively on and over a semiconductor substrate. A junction is formed adjacent the gate dielectric and a shaped spacer is formed around the gate. A spacer is formed under the shaped spacer and a liner is formed under the spacer. A first dielectric layer is formed over the semiconductor substrate, the shaped spacer, the spacer, the liner, and the gate. A second dielectric layer is formed over the first dielectric layer. A local interconnect opening is formed in the second dielectric layer down to the first dielectric layer. The local interconnect opening in the first dielectric layer is opened to expose the junction in the semiconductor substrate and the first gate. The local interconnect openings in the first and second dielectric layers are filled with a conductive material.
    Type: Grant
    Filed: January 27, 2005
    Date of Patent: October 10, 2006
    Assignee: Chartered Semiconductor Manufacturing Ltd.
    Inventors: Pradeep Ramachandramurthy Yelehanka, Tong Qing Chen, Zhi Yong Han, Jia Zhen Zheng, Kelvin Ong, Tian Hao Gu, Syn Kean Cheah
  • Patent number: 7081378
    Abstract: A method for manufacturing an integrated circuit structure includes providing a semiconductor substrate and forming a trench therein. A thyristor is formed around the trench and within the semiconductor substrate. The thyristor has at least four layers with three P-N junctions therebetween. A gate for the thyristor is formed within the trench. An access transistor is formed on the semiconductor substrate. An interconnect is formed between the thyristor and the access transistor.
    Type: Grant
    Filed: January 5, 2004
    Date of Patent: July 25, 2006
    Assignee: Chartered Semiconductor Manufacturing Ltd.
    Inventors: Jia Zhen Zheng, Weining Li, Tze Ho Simon Chan, Pradeep Ramachandramurthy Yelehanka
  • Patent number: 7067362
    Abstract: A method for manufacturing an integrated circuit structure includes providing a semiconductor substrate and forming at least one oxide-nitride-oxide dielectric layer above the semiconductor substrate. At least one implantation is formed into at least one area of the semiconductor substrate beneath the oxide-nitride-oxide dielectric layer subsequent to the formation of the oxide-nitride-oxide dielectric layer.
    Type: Grant
    Filed: October 17, 2003
    Date of Patent: June 27, 2006
    Assignee: Chartered Semiconductor Manufacturing Ltd.
    Inventors: Tommy Lai, Pradeep Ramachandramurthy Yelehanka, Jia Zhen Zheng, Weining Li
  • Patent number: 7015101
    Abstract: A method for manufacturing an integrated circuit structure includes providing a semiconductor substrate and forming a gate dielectric layer over the semiconductor substrate. The gate dielectric layer is formed in a plurality of thicknesses in a plurality of devices regions over the semiconductor substrate. A second dielectric layer is formed over at least one of the devices regions. A third dielectric layer is formed over at least a portion of the second dielectric layer. Ion traps are then selectively implanted in portions of the second dielectric layer.
    Type: Grant
    Filed: October 9, 2003
    Date of Patent: March 21, 2006
    Assignee: Chartered Semiconductor Manufacturing Ltd.
    Inventors: Jia Zhen Zheng, Pradeep Ramachandramurthy Yelehanka, Weining Li
  • Publication number: 20050148118
    Abstract: A method for manufacturing an integrated circuit structure includes providing a semiconductor substrate and forming a trench therein. A thyristor is formed around the trench and within the semiconductor substrate. The thyristor has at least four layers with three P-N junctions therebetween. A gate for the thyristor is formed within the trench. An access transistor is formed on the semiconductor substrate. An interconnect is formed between the thyristor and the access transistor.
    Type: Application
    Filed: January 5, 2004
    Publication date: July 7, 2005
    Applicant: CHARTERED SEMICONDUCTOR MANUFACTURING LTD.
    Inventors: Jia Zheng, Weining Li, Tze Chan, Pradeep Ramachandramurthy Yelehanka
  • Publication number: 20050098794
    Abstract: An integrated circuit structure includes a semiconductor substrate and a thyristor formed thereon. The thyristor has at least four layers, with three P-N junctions therebetween. At least two of the layers are formed horizontally and at least two of the layers are formed vertically. A gate is formed adjacent at least one of the vertically formed layers. An access transistor is formed on the semiconductor substrate, and an interconnect is formed between the thyristor and the access transistor.
    Type: Application
    Filed: December 11, 2004
    Publication date: May 12, 2005
    Applicant: CHARTERED SEMICONDUCTOR MANUFACTURING LTD.
    Inventors: Elgin Quek, Pradeep Ramachandramurthy Yelehanka, Jia Zheng, Tommy Lai, Weining Li
  • Publication number: 20050101102
    Abstract: A method for manufacturing an integrated circuit structure includes providing a semiconductor substrate and forming two trenches in the semiconductor substrate to define an active region therebetween. An implanted source region is formed in one of the trenches on one side of the active region. An implanted drain region is formed in the other trench on the other side of the active region. Shallow trench isolations are then formed in the trenches. One or more gates are formed over the active region, and contacts to the implanted source region and the implanted drain region are formed.
    Type: Application
    Filed: November 6, 2003
    Publication date: May 12, 2005
    Applicant: CHARTERED SEMICONDUCTOR MANUFACTURING LTD.
    Inventors: Tze Ho Chan, Weining Li, Elgin Quek, Jia Zheng, Pradeep Ramachandramurthy Yelehanka, Tommy Lai
  • Publication number: 20050085056
    Abstract: A method for manufacturing an integrated circuit structure includes providing a semiconductor substrate and forming at least one oxide-nitride-oxide dielectric layer above the semiconductor substrate. At least one implantation is formed into at least one area of the semiconductor substrate beneath the oxide-nitride-oxide dielectric layer subsequent to the formation of the oxide-nitride-oxide dielectric layer.
    Type: Application
    Filed: October 17, 2003
    Publication date: April 21, 2005
    Applicant: CHARTERED SEMICONDUCTOR MANUFACTURING LTD.
    Inventors: Tommy Lai, Pradeep Ramachandramurthy Yelehanka, Jia Zheng, Weining Li
  • Publication number: 20050079674
    Abstract: A method for manufacturing an integrated circuit structure includes providing a semiconductor substrate and forming a gate dielectric layer over the semiconductor substrate. The gate dielectric layer is formed in a plurality of thicknesses in a plurality of devices regions over the semiconductor substrate. A second dielectric layer is formed over at least one of the devices regions. A third dielectric layer is formed over at least a portion of the second dielectric layer. Ion traps are then selectively implanted in portions of the second dielectric layer.
    Type: Application
    Filed: October 9, 2003
    Publication date: April 14, 2005
    Applicant: CHARTERED SEMICONDUCTOR MANUFACTURING LTD.
    Inventors: Zia Zheng, Pradeep Ramachandramurthy Yelehanka, Weining Li
  • Publication number: 20050026337
    Abstract: A method for manufacturing an integrated circuit structure includes providing a semiconductor substrate and forming a thyristor thereon. The thyristor has at least four layers, with three P—N junctions therebetween. At least two of the layers are formed horizontally and at least two of the layers are formed vertically. A gate is formed adjacent at least one of the vertically formed layers. An access transistor is formed on the semiconductor substrate, and an interconnect is formed between the thyristor and the access transistor.
    Type: Application
    Filed: July 28, 2003
    Publication date: February 3, 2005
    Applicant: CHARTERED SEMICONDUCTOR MANUFACTURING LTD.
    Inventors: Elgin Quek, Pradeep Ramachandramurthy Yelehanka, Jia Zheng, Tommy Lai, Weining Li
  • Patent number: 6849481
    Abstract: A method for manufacturing an integrated circuit structure includes providing a semiconductor substrate and forming a thyristor thereon. The thyristor has at least four layers, with three P-N junctions therebetween. At least two of the layers are formed horizontally and at least two of the layers are formed vertically. A gate is formed adjacent at least one of the vertically formed layers. An access transistor is formed on the semiconductor substrate, and an interconnect is formed between the thyristor and the access transistor.
    Type: Grant
    Filed: July 28, 2003
    Date of Patent: February 1, 2005
    Assignee: Chartered Semiconductor Manufacturing Ltd.
    Inventors: Elgin Quek, Pradeep Ramachandramurthy Yelehanka, Jia Zhen Zheng, Tommy Lai, Weining Li
  • Publication number: 20040155269
    Abstract: An integrated circuit, and manufacturing method therefor, is provided. A gate dielectric and a gate are provided respectively on and over a semiconductor substrate. A junction is formed adjacent the gate dielectric and a shaped spacer is formed around the gate. A spacer is formed under the shaped spacer and a liner is formed under the spacer. A first dielectric layer is formed over the semiconductor substrate, the shaped spacer, the spacer, the liner, and the gate. A second dielectric layer is formed over the first dielectric layer. A local interconnect opening is formed in the second dielectric layer down to the first dielectric layer. The local interconnect opening in the first dielectric layer is opened to expose the junction in the semiconductor substrate and the first gate. The local interconnect openings in the first and second dielectric layers are filled with a conductive material.
    Type: Application
    Filed: February 7, 2003
    Publication date: August 12, 2004
    Applicant: Chartered Semiconductor Mfg. Ltd.
    Inventors: Pradeep Ramachandramurthy Yelehanka, Tong Qing Chen, Zhi Yong Han, Jia Zhen Zheng, Kelvin Ong, Tian Hao Gu, Syn Kean Cheah