Patents by Inventor Karl M. Metzger

Karl M. Metzger 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).

  • Crystal oscillator with wide tuning range
    Patent number: 7170357
    Abstract: A crystal oscillator having a crystal filter with multiple crystals in a ladder configuration, resonant at a desired operating frequency. An oscillatory signal loop feedback path includes a voltage controlled phase shifter operable to shift the phase of the signal in the feedback loop in response to an applied control voltage. The feedback loop also includes a loop phase shift circuit to ensure that the feedback signal is a multiple of 360°, and a band pass mode selection circuit for eliminating unwanted frequencies.
    Type: Grant
    Filed: March 4, 2005
    Date of Patent: January 30, 2007
    Assignee: Northrop Grumman Corporation
    Inventors: Michael M. Driscoll, Karl M. Metzger, Christopher R. Vale, Norman G. Matthews