Patents by Inventor David C. Graef

David C. Graef 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).

  • High bandwidth oscilloscope
    Patent number: 7219037
    Abstract: A method for improving bandwidth of an oscilloscope involves, in preferred embodiments, the use of frequency up-conversion and down-conversion techniques. In an illustrative embodiment the technique involves separating an input signal into a high frequency content and a low frequency content, down-converting the high frequency content in the analog domain so that it may be processed by the oscilloscope's analog front end, digitizing the low frequency content and the down-converted high frequency content, and forming a digital representation of the received analog signal from the digitized low frequency content and high frequency content.
    Type: Grant
    Filed: November 17, 2005
    Date of Patent: May 15, 2007
    Assignee: Lecroy Corporation
    Inventors: Peter J. Pupalaikis, David C. Graef
  • High bandwidth real time oscilloscope
    Patent number: 7139684
    Abstract: A method and apparatus for digitizing a data signal, the method comprising the steps of receiving an input analog data signal, splitting the received input analog data signal into a plurality of split signals, and mixing at least one of the split signals with a predetermined periodic function with a predetermined frequency. The split signals are then digitized and combined mathematically to form a single output data stream that is a substantially correct representation of the original input signal.
    Type: Grant
    Filed: November 22, 2005
    Date of Patent: November 21, 2006
    Assignee: LeCroy Corporation
    Inventors: Peter J. Pupalaikis, David C. Graef
  • High bandwidth real-time oscilloscope
    Patent number: 7058548
    Abstract: A method and apparatus for digitizing a data signal. An input analog data signal, is received and split into a plurality of split signals. At least one of the split signals is mixed with a predetermined periodic function with a predetermined frequency. The split signals are then digitized and combined mathematically to form a single output data stream that is a substantially correct representation of the original input signal.
    Type: Grant
    Filed: October 24, 2003
    Date of Patent: June 6, 2006
    Assignee: LeCroy Corporation
    Inventors: Peter J. Pupalaikis, David C. Graef
  • High bandwidth real-time oscilloscope
    Publication number: 20040128076
    Abstract: A method and apparatus for digitizing a data signal, the method comprising the steps of receiving an input analog data signal, splitting the received input analog data signal into a plurality of split signals, and mixing at least one of the split signals with a predetermined periodic function with a predetermined frequency. The split signals are then digitized and combined mathematically to form a single output data stream that is a substantially correct representation of the original input signal.
    Type: Application
    Filed: October 24, 2003
    Publication date: July 1, 2004
    Inventors: Peter J. Pupalaikis, David C. Graef