Patents by Inventor John Robinson Donnell

John Robinson Donnell 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).

  • Complementary distortion circuit
    Patent number: 4109212
    Abstract: A complementary distortion circuit for reducing the level of IM products in the output of a TWT amplifier. One embodiment of the invention includes a 3 db, 90.degree. coupler to divide the input signal into two components of equal amplitude but differing phase with an IM generator positioned in the path of each component. The IM generator may comprise non-linear phase modulators or non-linear amplitude modulators. The two components are then re-combined in a second, 3 db, 90.degree. coupler. The non-linear phase-modulators may comprise varactors and the non-linear amplitude modulators may comprise varistors. The unit is intended to operate in the microwave region.
    Type: Grant
    Filed: October 29, 1976
    Date of Patent: August 22, 1978
    Assignee: Bell Telephone Laboratories, Incorporated
    Inventors: John Robinson Donnell, George Ludwig Heiter, Hotze Miedema