Patents by Inventor Kenta SHIBASAKI

Kenta SHIBASAKI 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).

  • Publication number: 20200295742
    Abstract: According to one embodiment, a semiconductor memory device includes a memory cell array, first to third circuits. The first circuit is configured to control duty cycles of first and second signals based on a third signal, and output fourth and fifth signals. The second circuit is configured to acquire information regarding duty cycles. The third circuit is configured to control the third signal. The second circuit includes a switching circuit and a comparator. The switching circuit is configured to transfer the fourth and fifth signals to first and second nodes. The comparator is configured to compare a signal voltages in the first and second nodes, and output the comparison result to the third circuit.
    Type: Application
    Filed: September 10, 2019
    Publication date: September 17, 2020
    Applicant: TOSHIBA MEMORY CORPORATION
    Inventors: Yousuke HAGIWARA, Kenta SHIBASAKI, Yumi TAKADA
  • Publication number: 20200185044
    Abstract: A semiconductor storage device includes a first chip and a second chip. In response to a first command that is received on a first terminal of the first chip and a second terminal of the second chip that are connected to a command signal line, the first chip and the second chip execute in parallel a first correction process of correcting a duty cycle of a first output signal generated by the first chip and a second correction process of correcting a duty cycle of a second output signal generated by the second chip, respectively, according a common toggle signal.
    Type: Application
    Filed: August 30, 2019
    Publication date: June 11, 2020
    Inventors: Yumi TAKADA, Yasuhiro HIRASHIMA, Kenta SHIBASAKI, Yousuke HAGIWARA
  • Patent number: 10504598
    Abstract: A non-volatile semiconductor storage device includes a memory cell array and a control circuit configured to control a data write operation for the memory cell array in a first or second write mode in response to a write command sequence. In the first write mode, the control circuit performs a first write operation, which includes an operation in which one or more bit lines are charged according to write data and an operation in which a write voltage is applied to a selected word line according to address data included in the write command sequence. In the second write mode, the control circuit performs a second write operation, which includes the operation in which the one or more bit lines are charged according to the write data and does not include the operation in which the write voltage is applied to the selected word line.
    Type: Grant
    Filed: January 26, 2018
    Date of Patent: December 10, 2019
    Assignee: Toshiba Memory Corporation
    Inventors: Kazuto Uehara, Yoshikazu Harada, Kenta Shibasaki, Junichi Sato, Akio Sugahara
  • Publication number: 20180261290
    Abstract: A non-volatile semiconductor storage device includes a memory cell array and a control circuit configured to control a data write operation for the memory cell array in a first or second write mode in response to a write command sequence. In the first write mode, the control circuit performs a first write operation, which includes an operation in which one or more bit lines are charged according to write data and an operation in which a write voltage is applied to a selected word line according to address data included in the write command sequence. In the second write mode, the control circuit performs a second write operation, which includes the operation in which the one or more bit lines are charged according to the write data and does not include the operation in which the write voltage is applied to the selected word line.
    Type: Application
    Filed: January 26, 2018
    Publication date: September 13, 2018
    Inventors: Kazuto UEHARA, Yoshikazu HARADA, Kenta SHIBASAKI, Junichi SATO, Akio SUGAHARA