Patents by Inventor Derek E. Toeppen

Derek E. Toeppen 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).

  • Phase dither of an acquisition clock using a phase lock loop
    Patent number: 5900755
    Abstract: The phase of an acquisition clock for a digital oscilloscope is modulated by summing an offset voltage with the output of the phase detector of a phase lock loop. The offset voltage is generated by a digital-to-analog converter which is fed input values by a microprocessor running a number generator routine.
    Type: Grant
    Filed: August 11, 1997
    Date of Patent: May 4, 1999
    Assignee: Hewlett-Packard, Co.
    Inventors: Derek E. Toeppen, B. Allen Montijo, Reginald Kellum
  • Phase dither of an acquisition clock using a delay lock loop
    Patent number: 5789954
    Abstract: The phase of an acquisition clock for a digital oscilloscope is modulated by summing an offset voltage with the output of the phase detector of a delay lock loop. The offset voltage is generated by a digital-to-analog converter which is fed input values by a microprocessor running a number generator routine.
    Type: Grant
    Filed: June 27, 1997
    Date of Patent: August 4, 1998
    Assignee: Hewlett-Packard Co.
    Inventors: Derek E. Toeppen, B. Allen Montijo, Reginald Kellum