Patents by Inventor James Roger Clark, II

James Roger Clark, II 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).

  • Method and apparatus for high efficiency wideband power amplification
    Patent number: 6175273
    Abstract: A method and apparatus for efficient power amplification of a wideband signal with a correspondingly wide modulation bandwidth includes an envelope detector (220), an adaptive split band modulator (270), and a power amplifier (260). The adaptive split band modulator (270) amplifies the low frequency components using a class S modulator (760), and amplifies the high frequency components using a class B amplifier (750). The power supply of the class B amplifier (750) is adaptively modified as a function of the amplitude of the signal that it amplifies. In this manner, the class B amplifier (750) operates at a higher efficiency.
    Type: Grant
    Filed: April 2, 2000
    Date of Patent: January 16, 2001
    Assignee: Motorola, Inc.
    Inventors: Bernard Eugene Sigmon, Frederick H. Raab, James Roger Clark, II
  • Method and apparatus for high efficiency wideband power amplification
    Patent number: 6084468
    Abstract: A method and apparatus for efficient power amplification of a wideband signal with a correspondingly wide modulation bandwidth includes an envelope detector (220), an adaptive split band modulator (270), and a power amplifier (260). The adaptive split band modulator (270) amplifies the low frequency components using a class S modulator (760), and amplifies the high frequency components using a class B amplifier (750). The power supply of the class B amplifier (750) is adaptively modified as a function of the amplitude of the signal that it amplifies. In this manner, the class B amplifier (750) operates at a higher efficiency.
    Type: Grant
    Filed: October 6, 1997
    Date of Patent: July 4, 2000
    Assignee: Motorola, Inc.
    Inventors: Bernard Eugene Sigmon, Frederick H. Raab, James Roger Clark, II
  • Suspended monolithic microwave integrated circuit and method of manufacture
    Patent number: 5949312
    Abstract: A MMIC for providing a suspended transmission medium, comprising a MMIC chip, an upper ground plane overlying and spaced from critical circuitry and a lower ground plane underlying and spaced from the critical circuitry. The upper and lower ground planes are spaced from the critical circuitry at electrically similar distances. The portion of the MMIC chip that has the critical circuitry is suspended over a recess in the housing floor.
    Type: Grant
    Filed: October 30, 1997
    Date of Patent: September 7, 1999
    Assignee: Motorola, Inc.
    Inventors: Kenneth Vern Buer, David Warren Corman, Deborah Sue Dendy, James Roger Clark, II