Patents by Inventor Vijay Ullal

Vijay Ullal 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: 9966350
    Abstract: Wafer-level package semiconductor devices are described that have a smallest distance between two adjacent attachment bumps smaller than about twenty-five percent (25%) of a pitch between the two adjacent attachment bumps. The smallest distance between the two adjacent attachment bumps allows for an increase in the number of attachment bumps per area without reducing the size of the bumps, which increases solder reliability. The increased solder reliability may reduce stress to the attachment bumps, particularly stress caused by CTE mismatch during thermal cycling tests, dynamic deformation during drop tests or cyclic bending tests, and so on.
    Type: Grant
    Filed: June 6, 2011
    Date of Patent: May 8, 2018
    Assignee: Maxim Integrated Products, Inc.
    Inventors: Vijay Ullal, Arkadii V. Samoilov
  • Publication number: 20140312458
    Abstract: In one general aspect, a method can include forming a redistribution layer on a substrate using a first electroplating process, and forming a conductive pillar on the redistribution layer using a second electroplating process. The method can include coupling a semiconductor die to the redistribution layer, and can include forming a molding layer encapsulating at least a portion of the redistribution layer and at least a portion of the conductive pillar.
    Type: Application
    Filed: November 27, 2013
    Publication date: October 23, 2014
    Applicant: Fairchild Semiconductor Corporation
    Inventors: Ahmad ASHRAFZADEH, Vijay ULLAL, Justin CHIANG, Daniel KINZER, Michael M. DUBE, Oseob JEON, Chung-Lin WU, Maria Cristina ESTACIO
  • Publication number: 20120306071
    Abstract: Wafer-level package semiconductor devices are described that have a smallest distance between two adjacent attachment bumps smaller than about twenty-five percent (25%) of a pitch between the two adjacent attachment bumps. The smallest distance between the two adjacent attachment bumps allows for an increase in the number of attachment bumps per area without reducing the size of the bumps, which increases solder reliability. The increased solder reliability may reduce stress to the attachment bumps, particularly stress caused by CTE mismatch during thermal cycling tests, dynamic deformation during drop tests or cyclic bending tests, and so on.
    Type: Application
    Filed: June 6, 2011
    Publication date: December 6, 2012
    Applicant: Maxim Integrated Products, Inc.
    Inventors: Vijay Ullal, Arkadii V. Samoilov
  • Publication number: 20080150092
    Abstract: Various embodiments of the present invention relate to systems, devices, and methods for treating a semiconductor substrate, such as a silicon wafer, in order to reduce current leakage therein. A semiconductor substrate is provided a plurality of heating treatments that create a denuded zone adjacent to a surface of the substrate and a core zone below the denuded zone. Oxygen impurities within the denuded zone are removed through an oxygen out-diffusion heat treatment. A plurality of macroscopic bulk micro defects is generated within the core zone through the combination of an agglomeration heat treatment and a macroscopic growth heat treatment. This plurality of macroscopic bulk micro defects inhibits migration of metallic contaminants that are located within the substrate. For exemplary purposes, certain embodiments are described relating to a semiconductor wafer heated in a sequence of three treatments.
    Type: Application
    Filed: March 3, 2008
    Publication date: June 26, 2008
    Inventors: Amit Subhash Kelkar, Joshua Li, Danh John C. Nguyen, Vijay Ullal
  • Publication number: 20080135988
    Abstract: Various embodiments of the present invention relate to systems, devices, and methods for treating a semiconductor substrate, such as a silicon wafer, in order to reduce current leakage therein. A semiconductor substrate is provided a plurality of heating treatments that create a denuded zone adjacent to a surface of the substrate and a core zone below the denuded zone. Oxygen impurities within the denuded zone are removed through an oxygen out-diffusion heat treatment. A plurality of macroscopic bulk micro defects is generated within the core zone through the combination of an agglomeration heat treatment and a macroscopic growth heat treatment. This plurality of macroscopic bulk micro defects inhibits migration of metallic contaminants that are located within the substrate. For exemplary purposes, certain embodiments are described relating to a semiconductor wafer heated in a sequence of three treatments.
    Type: Application
    Filed: December 7, 2006
    Publication date: June 12, 2008
    Inventors: Amit Subhash Kelkar, Joshua Li, Danh John C. Nguyen, Vijay Ullal