Patents by Inventor Yayoi Tsubouchi

Yayoi Tsubouchi 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).

  • Semiconductor memory device with reduced power consumption during refresh operation
    Patent number: 6504787
    Abstract: A row-related control circuit is provided which changes for a normal read operation and for refresh operation the delay time from a time at which a word line is activated to a time at which a sense amplifier is activated. Even when the refresh period is made longer and the charges in a memory cell are reduced, the sensitivity of the sense amplifier is heightened so that the refresh operation becomes possible. Thus, power consumption can be reduced by prolonging the refresh intervals.
    Type: Grant
    Filed: November 16, 2001
    Date of Patent: January 7, 2003
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventors: Yayoi Tsubouchi, Takashi Itou
  • SEMICONDUCTOR MEMORY DEVICE WITH REDUCED POWER CONSUMPTION DURING REFRESH OPERATION
    Publication number: 20020186609
    Abstract: A row-related control circuit is provided which changes for a normal read operation and for refresh operation the delay time from a time at which a word line is activated to a time at which a sense amplifier is activated. Even when the refresh period is made longer and the charges in a memory cell are reduced, the sensitivity of the sense amplifier is heightened so that the refresh operation becomes possible. Thus, power consumption can be reduced by prolonging the refresh intervals.
    Type: Application
    Filed: November 16, 2001
    Publication date: December 12, 2002
    Applicant: Mitsubishi Denki Kabushiki Kaisha
    Inventors: Yayoi Tsubouchi, Takashi Itou