Patents by Inventor Takao Kutsuno

Takao Kutsuno 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).

  • Digital calibration method and apparatus for A/D or D/A converters
    Patent number: 6351228
    Abstract: Digital calibration of an A/D converter, which converts an analog signal into a digital signal, is performed by first sequentially inputting two analog signals of different values to the A/D converter, then calculating an offset calibration value and gain calibration coefficient on the basis of two digital converted signals generated from the A/D converter and then calibrating a digital signal output from the A/D converter on the basis of the thus-calculated offset calibration value and gain calibration coefficient.
    Type: Grant
    Filed: January 28, 2000
    Date of Patent: February 26, 2002
    Assignee: Hitachi Electronics Engineering Co., Ltd.
    Inventors: Takao Kutsuno, Atsuhiko Ishida, Seiken Udou, Tsuneo Yamaba, Hiroshi Ikeda