Patents by Inventor Hugh S. Wallace

Hugh S. Wallace 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).

  • Parametric measurement of high-speed I/O systems
    Patent number: 7571363
    Abstract: A phase comparator is used to test a device under test comprising an input/output (I/O) circuit by applying a signal to the device under test; extracting a phase signal from the phase comparator; and determining parametric information pertaining to the I/O circuit of the device under test from the phase signal.
    Type: Grant
    Filed: May 18, 2006
    Date of Patent: August 4, 2009
    Assignee: Agilent Technologies, Inc.
    Inventors: Hugh S. Wallace, Adrian Wan-Chew Seet, Klaus-Dieter Hilliges
  • Parametric Measurement of High-Speed I/O Systems
    Publication number: 20070268963
    Abstract: A phase comparator is used to test a device under test comprising an input/output (I/O) circuit by applying a signal to the device under test; extracting a phase signal from the phase comparator; and determining parametric information pertaining to the I/O circuit of the device under test from the phase signal.
    Type: Application
    Filed: May 18, 2006
    Publication date: November 22, 2007
    Inventors: Hugh S. Wallace, Adrian Wan-Chew Seet, Klaus-Dieter Hilliges
  • Phase locked time interval analyzer
    Patent number: 6975106
    Abstract: A method of analysis of a time interval between two selected measurement edges of interest includes locking a plurality of at least three substantially interchangeable oscillators to a common reference frequency, the oscillators containing digital locked-loop (DLL) circuit architecture. The method includes operating one oscillator as a timebase oscillator, and operating the other oscillators as edge-resettable measurement oscillators. The method further includes coupling one oscillator with a switched and physically-immutable parametric variation, producing an offset in the frequency of the coupled oscillator relative to the frequency of the other oscillators.
    Type: Grant
    Filed: October 15, 2004
    Date of Patent: December 13, 2005
    Assignee: Agilent Technologies, Inc.
    Inventors: Hugh S. Wallace, G. Robert Elsheimer, Ceceli Ann Wilhelmi