Patents by Inventor Alan E. Mathieu

Alan E. Mathieu 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).

  • Edge integrating phase detector
    Patent number: 5192915
    Abstract: An edge integrating phase detector for a phase locked loop passes a portion of a sync edge of an input video signal as a sampled signal to an integrator in response to a gate pulse nominally centered on a timing reference point of the sync edge. The sampled signal has a positive and negative portion. The integrator produces from the sampled signal a control signal for a VCO that is proportional to the unbalance between the positive and negative portions. The gate pulse is generated from the output of the VCO as a function of the nominal period of the input video signal.
    Type: Grant
    Filed: July 27, 1992
    Date of Patent: March 9, 1993
    Assignee: Tektronix, Inc.
    Inventors: Alan E. Mathieu, Edward D. Wardzala, Michael S. Overton