Patents by Inventor Glenn E. R. Cowan

Glenn E. R. Cowan 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).

  • Architecture for maintaining constant voltage-controlled oscillator gain
    Patent number: 7741919
    Abstract: A voltage controlled oscillator and a method of operating a voltage-controlled oscillator are disclosed. The oscillator comprises a current controlled oscillator having a variable frequency current output, a first control path for generating a first control current having a first adjustable gain, and a second control path for generating a second control current having a second adjustable gain. A summer is provided for adding the first and second control currents to obtain a summed control current, and for applying the summed control current as an input current to the current controlled oscillator. A control sub-circuit is used for controlling the gain of the first control current as a function of a defined voltage on the second control path to maintain constant the gain of the current output of the current controlled oscillator over a given operating range of the current controlled oscillator.
    Type: Grant
    Filed: May 2, 2008
    Date of Patent: June 22, 2010
    Assignee: International Business Machines Corporation
    Inventors: Glenn E. R. Cowan, Daniel J. Friedman, Mounir Meghelli
  • ARCHITECTURE FOR MAINTAINING CONSTANT VOLTAGE-CONTROLLED OSCILLATOR GAIN
    Publication number: 20090273405
    Abstract: A voltage controlled oscillator and a method of operating a voltage-controlled oscillator are disclosed. The oscillator comprises a current controlled oscillator having a variable frequency current output, a first control path for generating a first control current having a first adjustable gain, and a second control path for generating a second control current having a second adjustable gain. A summer is provided for adding the first and second control currents to obtain a summed control current, and for applying the summed control current as an input current to the current controlled oscillator. A control sub-circuit is used for controlling the gain of the first control current as a function of a defined voltage on the second control path to maintain constant the gain of the current output of the current controlled oscillator over a given operating range of the current controlled oscillator.
    Type: Application
    Filed: May 2, 2008
    Publication date: November 5, 2009
    Applicant: INTERNATIONAL BUSINESS MACHINES CORPORATION
    Inventors: Glenn E. R. Cowan, Daniel J. Friedman, Mounir Meghelli