Patents by Inventor James L. Drewniak

James L. Drewniak 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).

  • Prediction of dynamic current waveform and spectrum in a semiconductor device
    Patent number: 7962870
    Abstract: A method for determining a current spectrum for a circuit design is provided. The method includes determining timing characteristics and power consumption characteristics for the circuit design. From the timing characteristics and the power consumption characteristics a time domain current waveform is constructed. The time domain current waveform is then converted to a frequency domain current waveform. With the frequency domain waveform, one skilled in the art can then identify a location and an amount of decoupling capacitors for a printed circuit board housing the circuit design based on the frequency domain current waveform. A computing system configured to perform the method is also provided.
    Type: Grant
    Filed: May 6, 2008
    Date of Patent: June 14, 2011
    Assignee: Altera Corporation
    Inventors: Peter Boyle, Iliya G. Zamek, Zhe Li, Shishuang Sun, Bozidar Krsnik, James L. Drewniak, Xiaohe Chen, Sandeep Kamalakar Reddy Chandra
  • PREDICTION OF DYNAMIC CURRENT WAVEFORM AND SPECTRUM IN A SEMICONDUCTOR DEVICE
    Publication number: 20080288898
    Abstract: A method for determining a current spectrum for a circuit design is provided. The method includes determining timing characteristics and power consumption characteristics for the circuit design. From the timing characteristics and the power consumption characteristics a time domain current waveform is constructed. The time domain current waveform is then converted to a frequency domain current waveform. With the frequency domain waveform, one skilled in the art can then identify a location and an amount of decoupling capacitors for a printed circuit board housing the circuit design based on the frequency domain current waveform. A computing system configured to perform the method is also provided.
    Type: Application
    Filed: May 6, 2008
    Publication date: November 20, 2008
    Inventors: Peter Boyle, Iliya G. Zamek, Zhe Li, Shishuang Sun, Bozidar Krsnik, James L. Drewniak
  • Strain sensitive coax cable sensors for monitoring structures
    Patent number: 7421910
    Abstract: The invention provides increased structural monitoring systems that have sensitive continuous coaxial cable sensors. A preferred embodiment sensor cable of the invention includes an inner conductor, a dielectric jacket, and an outer conductor that is configured to passively deform responsively to strain in an associated structure. The deformation can be aided by the physical structure of the dielectric jacket, the outer conductor, or a combination of both. The deformation translates strain into a measurable change in a reflection coefficient associated with the outer conductor.
    Type: Grant
    Filed: October 6, 2005
    Date of Patent: September 9, 2008
    Assignee: The Curators of the university of Missouri
    Inventors: Genda Chen, James L. Drewniak, Huimin Mu, David Pommerenke
  • Introducing loss in a power bus to reduce EMI and electrical noise
    Patent number: 6798666
    Abstract: A printed circuit board includes a power layer for use in providing electrical power to circuit components and a ground layer for use in carrying electrical current away from the circuit components. A loss element connects electrically between the power layer and ground layer to suppress electrical noise caused by changes in current flow in the circuit components.
    Type: Grant
    Filed: December 29, 2000
    Date of Patent: September 28, 2004
    Assignee: NCR Corporation
    Inventors: Arthur Ray Alexander, James L. Drewniak