Patents by Inventor Caleb Roberts

Caleb Roberts 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).

  • Multistage pulse width modulator
    Patent number: 6784710
    Abstract: Two or more pulse width modulation stages, each having progressively higher resolution, are utilized to allow the lower resolution stage or stages to operate at lower clock speeds. Later stages are operated at higher clock speeds and thus a smaller portion of the total pulse width modulation circuit utilizes the higher clock speed. Additionally, later stages operate over smaller time intervals in order to reduce usage of the later stages.
    Type: Grant
    Filed: December 11, 2002
    Date of Patent: August 31, 2004
    Assignee: Cirrus Logic, Inc.
    Inventors: Jack B. Andersen, Caleb Roberts
  • Multistage pulse width modulator
    Publication number: 20040113671
    Abstract: Two or more pulse width modulation stages, each having progressively higher resolution, are utilized to allow the lower resolution stage or stages to operate at lower clock speeds. Later stages are operated at higher clock speeds and thus a smaller portion of the total pulse width modulation circuit utilizes the higher clock speed. Additionally, later stages operate over smaller time intervals in order to reduce usage of the later stages.
    Type: Application
    Filed: December 11, 2002
    Publication date: June 17, 2004
    Inventors: Jack B. Anderson, Caleb Roberts