Patents by Inventor Takayasu Kitou

Takayasu Kitou 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).

  • DLL circuit, imaging device, and memory device
    Patent number: 7916561
    Abstract: A variable delay circuit successively delays an input clock to generate a plurality of delayed clocks having different phases. A phase comparison circuit receives a first reference clock, which is either one of the delayed clocks or the input clock, and a second reference clock, which is one of the delayed clocks and whose phase lags behind that of the first reference clock, specifies a validated interval for the second reference clock, and compares the phases of the first and second reference clocks according to voltage levels of the first and second reference clocks only during the validated interval. A delay control circuit controls a delay time in the variable delay circuit according to a result of the comparison obtained by the phase comparison circuit.
    Type: Grant
    Filed: December 11, 2008
    Date of Patent: March 29, 2011
    Assignee: Panasonic Corporation
    Inventors: Norihide Kinugasa, Mitsuhiko Otani, Naohisa Hatani, Takayasu Kitou
  • DLL CIRCUIT, IMAGING DEVICE, AND MEMORY DEVICE
    Publication number: 20090154268
    Abstract: A variable delay circuit successively delays an input clock to generate a plurality of delayed clocks having different phases. A phase comparison circuit receives a first reference clock, which is either one of the delayed clocks or the input clock, and a second reference clock, which is one of the delayed clocks and whose phase lags behind that of the first reference clock, specifies a validated interval for the second reference clock, and compares the phases of the first and second reference clocks according to voltage levels of the first and second reference clocks only during the validated interval. A delay control circuit controls a delay time in the variable delay circuit according to a result of the comparison obtained by the phase comparison circuit.
    Type: Application
    Filed: December 11, 2008
    Publication date: June 18, 2009
    Inventors: Norihide KINUGASA, Mitsuhiko Otani, Naohisa Hatani, Takayasu Kitou