Patents by Inventor Steven G. Lovejoy

Steven G. Lovejoy 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: 8032349
    Abstract: Disclosed herein are embodiments of an automated, fast and efficient method of generating a customized compact model that represents a semiconductor device at the chip, wafer or multi-wafer level in a specific manufacturing environment. Specifically, measurement data is collected from a specific manufacturing environment and sorted by channel lengths. Then, an optimizer is used to generate customized modeling parameters based on the measurement data. The optimization processes is a multi-step process. First, a first set of modeling parameters is generated based on measurement data associated with a long channel length. Second, a second set of modeling parameters is generated based on the first set and on measurement data associated with a short channel length. Finally, the customized modeling parameters are generated based on both the first set and the second set. The customized modeling parameters are used to generate a customized compact device model representative of the specific manufacturing environment.
    Type: Grant
    Filed: January 25, 2007
    Date of Patent: October 4, 2011
    Assignee: International Business Machines Corporation
    Inventors: Sim Y. Loo, Steven G. Lovejoy, Myung-Hee Na, Edward J. Nowak, Scott K. Springer
  • Patent number: 7783466
    Abstract: A method and system are disclosed for preserving measured temperature and geometric behavior of a hardware model while adjusting the model to match specified target values. In one embodiment, the method includes measuring a characteristic of an integrated circuit (IC) chip at a plurality of temperatures; modeling to form a hardware model for the characteristic versus temperature based on the measuring; obtaining a known first target value of the characteristic for at least one temperature in the hardware model; determining a plurality of second target values for the characteristic for a corresponding plurality of temperatures in the hardware model; and modeling to form a target model for the characteristic based on the first known target value and the plurality of second target values.
    Type: Grant
    Filed: May 1, 2007
    Date of Patent: August 24, 2010
    Assignee: International Business Machines Corporation
    Inventors: John R. Jones, Steven G. Lovejoy, Henry W. Trombley, Josef S. Watts
  • Publication number: 20080275675
    Abstract: A method and system are disclosed for preserving measured temperature and geometric behavior of a hardware model while adjusting the model to match specified target values. In one embodiment, the method includes measuring a characteristic of an integrated circuit (IC) chip at a plurality of temperatures; modeling to form a hardware model for the characteristic versus temperature based on the measuring; obtaining a known first target value of the characteristic for at least one temperature in the hardware model; determining a plurality of second target values for the characteristic for a corresponding plurality of temperatures in the hardware model; and modeling to form a target model for the characteristic based on the first known target value and the plurality of second target values.
    Type: Application
    Filed: May 1, 2007
    Publication date: November 6, 2008
    Applicant: International Business Machines Corporation
    Inventors: John R. Jones, Steven G. Lovejoy, Henry W. Trombley, Josef S. Watts
  • Publication number: 20080183442
    Abstract: Disclosed herein are embodiments of an automated, fast and efficient method of generating a customized compact model that represents a semiconductor device at the chip, wafer or multi-wafer level in a specific manufacturing environment. Specifically, measurement data is collected from a specific manufacturing environment and sorted by channel lengths. Then, an optimizer is used to generate customized modeling parameters based on the measurement data. The optimization processes is a multi-step process. First, a first set of modeling parameters is generated based on measurement data associated with a long channel length. Second, a second set of modeling parameters is generated based on the first set and on measurement data associated with a short channel length. Finally, the customized modeling parameters are generated based on both the first set and the second set. The customized modeling parameters are used to generate a customized compact device model representative of the specific manufacturing environment.
    Type: Application
    Filed: January 25, 2007
    Publication date: July 31, 2008
    Inventors: Sim Y. Loo, Steven G. Lovejoy, Myung-Hee Na, Edward J. Nowak, Scott K. Springer
  • Patent number: 7124387
    Abstract: A method (300) of placing a to-be-placed integrated circuit macro (404) adjacent one or more already-placed macros (400) aboard an integrated circuit chip (100). The method includes the step of performing a canonical ordering of the edges of the to-be-placed and already placed macros. Then, an edge constraint vector (500, 526) is generated for each active edge (668) of the already-placed macro(s) and each edge of the to-be-placed macro. Each of the edge constraint vectors of the to-be-placed macro is compared to each edge constraint vector of the active edge(s) using a string matching algorithm so as to determine whether any edges of the to-be-placed macro are compatible with any active edges of the already-placed macro(s). The method may be implemented in a CAD system (600).
    Type: Grant
    Filed: July 29, 2004
    Date of Patent: October 17, 2006
    Assignee: International Business Machines Corporation
    Inventors: Robert J. Allen, Steven G. Lovejoy, Kevin W. McCullen