Patents by Inventor Yuui Shimizu

Yuui Shimizu 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).

  • Patent number: 11763890
    Abstract: A semiconductor memory device includes a substrate, first and second P-type well regions on the substrate, an N-type well region on the substrate and sandwiched between the first and second P-type well regions, a first peripheral circuit on a region of the first P-type well region adjacent to the N-type well region and supplied with a reference voltage via a first wiring, and a second peripheral circuit on a region of the second P-type well region adjacent to the N-type well region and supplied with a reference voltage via a second wiring.
    Type: Grant
    Filed: August 23, 2021
    Date of Patent: September 19, 2023
    Assignee: Kioxia Corporation
    Inventors: Yuki Shimizu, Yoshihiko Kamata, Tsukasa Kobayashi, Hideyuki Kataoka, Koji Kato, Takumi Fujimoto, Yoshinao Suzuki, Yuui Shimizu
  • Publication number: 20210383868
    Abstract: A semiconductor memory device includes a substrate, first and second P-type well regions on the substrate, an N-type well region on the substrate and sandwiched between the first and second P-type well regions, a first peripheral circuit on a region of the first P-type well region adjacent to the N-type well region and supplied with a reference voltage via a first wiring, and a second peripheral circuit on a region of the second P-type well region adjacent to the N-type well region and supplied with a reference voltage via a second wiring.
    Type: Application
    Filed: August 23, 2021
    Publication date: December 9, 2021
    Inventors: Yuki SHIMIZU, Yoshihiko KAMATA, Tsukasa KOBAYASHI, Hideyuki KATAOKA, Koji KATO, Takumi FUJIMOTO, Yoshinao SUZUKI, Yuui SHIMIZU
  • Patent number: 11133066
    Abstract: A semiconductor memory device includes a substrate, first and second P-type well regions on the substrate, an N-type well region on the substrate and sandwiched between the first and second P-type well regions, a first peripheral circuit on a region of the first P-type well region adjacent to the N-type well region and supplied with a reference voltage via a first wiring, and a second peripheral circuit on a region of the second P-type well region adjacent to the N-type well region and supplied with a reference voltage via a second wiring.
    Type: Grant
    Filed: July 21, 2020
    Date of Patent: September 28, 2021
    Assignee: KIOXIA CORPORATION
    Inventors: Yuki Shimizu, Yoshihiko Kamata, Tsukasa Kobayashi, Hideyuki Kataoka, Koji Kato, Takumi Fujimoto, Yoshinao Suzuki, Yuui Shimizu
  • Publication number: 20200350016
    Abstract: A semiconductor memory device includes a substrate, first and second P-type well regions on the substrate, an N-type well region on the substrate and sandwiched between the first and second P-type well regions, a first peripheral circuit on a region of the first P-type well region adjacent to the N-type well region and supplied with a reference voltage via a first wiring, and a second peripheral circuit on a region of the second P-type well region adjacent to the N-type well region and supplied with a reference voltage via a second wiring.
    Type: Application
    Filed: July 21, 2020
    Publication date: November 5, 2020
    Inventors: Yuki SHIMIZU, Yoshihiko KAMATA, Tsukasa KOBAYASHI, Hideyuki KATAOKA, Koji KATO, Takumi FUJIMOTO, Yoshinao SUZUKI, Yuui SHIMIZU
  • Patent number: 10762963
    Abstract: A semiconductor memory device comprises a first memory cell array including a first memory cell and a second memory cell array including a second memory cell, a first transistor electrically connectable to a first end of the first memory cell via a first source line, a second transistor connectable to a first end of the second memory cell via a second source line, a pad supplied with a reference voltage from outside, a first wiring that electrically connects the first transistor and the pad, and a second wiring that is different from the first wiring and electrically connects the second transistor and the pad.
    Type: Grant
    Filed: September 2, 2018
    Date of Patent: September 1, 2020
    Assignee: TOSHIBA MEMORY CORPORATION
    Inventors: Yuki Shimizu, Yoshihiko Kamata, Tsukasa Kobayashi, Hideyuki Kataoka, Koji Kato, Takumi Fujimoto, Yoshinao Suzuki, Yuui Shimizu
  • Publication number: 20190348120
    Abstract: A semiconductor memory device comprises a first memory cell array including a first memory cell and a second memory cell array including a second memory cell, a first transistor electrically connectable to a first end of the first memory cell via a first source line, a second transistor connectable to a first end of the second memory cell via a second source line, a pad supplied with a reference voltage from outside, a first wiring that electrically connects the first transistor and the pad, and a second wiring that is different from the first wiring and electrically connects the second transistor and the pad.
    Type: Application
    Filed: September 2, 2018
    Publication date: November 14, 2019
    Inventors: Yuki SHIMIZU, Yoshihiko KAMATA, Tsukasa KOBAYASHI, Hideyuki KATAOKA, Koji KATO, Takumi FUJIMOTO, Yoshinao SUZUKI, Yuui SHIMIZU
  • Patent number: 10431266
    Abstract: A semiconductor storage device includes: a first terminal, a plurality of first and second output buffers, a register, a plurality of first pre-drivers including a plurality of first transistors operating according to a first signal, and a plurality of second pre-drivers including a plurality of second transistors operating according to a second signal. A first output control circuit selects the first pre-drivers in accordance with a third signal obtained by conversion of the second signal. A second output control circuit selects the second pre-drivers in accordance with a fourth signal obtained by conversion the first signal. A third output circuit transmits an output signal to the first and second output circuits.
    Type: Grant
    Filed: August 6, 2018
    Date of Patent: October 1, 2019
    Assignee: Toshiba Memory Corporation
    Inventors: Kazuyoshi Muraoka, Masami Masuda, Junya Matsuno, Masatoshi Kohno, Yuui Shimizu
  • Patent number: 10340857
    Abstract: According to one embodiment, the amplifier circuit includes a first and second differential amplifier. The first differential amplifier includes first and second transistors, a first current source, and a second current source that is configured to supply a current to the first and second transistors via a first switch element. The second differential amplifier includes third and fourth transistors, a third current source, and a fourth current source that is configured to supply a current to the third and fourth transistors via a second switch element. A first signal is input to the first and third transistors. The first switch elements are controlled by third and fourth signals, respectively. The third signal and the fourth signal are complementary.
    Type: Grant
    Filed: September 8, 2017
    Date of Patent: July 2, 2019
    Assignee: TOSHIBA MEMORY CORPORATION
    Inventors: Junya Matsuno, Kazuyoshi Muraoka, Masami Masuda, Yuui Shimizu, Masatoshi Kohno, Masahiro Hosoya
  • Publication number: 20190088294
    Abstract: A semiconductor storage device includes: a first terminal, a plurality of first and second output buffers, a register, a plurality of first pre-drivers including a plurality of first transistors operating according to a first signal, and a plurality of second pre-drivers including a plurality of second transistors operating according to a second signal. A first output control circuit selects the first pre-drivers in accordance with a third signal obtained by conversion of the second signal. A second output control circuit selects the second pre-drivers in accordance with a fourth signal obtained by conversion the first signal. A third output circuit transmits an output signal to the first and second output circuits.
    Type: Application
    Filed: August 6, 2018
    Publication date: March 21, 2019
    Inventors: Kazuyoshi MURAOKA, Masami MASUDA, Junya MATSUNO, Masatoshi KOHNO, Yuui SHIMIZU
  • Patent number: 10121778
    Abstract: According to one embodiment, an electrostatic discharge semiconductor device includes one or more wiring layers first disposed over a substrate, including: a wiring electrically connected at a first connecting point of a pad, a second wiring electrically connected at a second connecting point of a ground wiring, and a third wiring electrically connected at a third connecting point of the ground wiring; a first transistor formed in the substrate comprising a first diffusion region electrically connected to the first wiring, a second diffusion region electrically connected to the second wiring, and a gate electrically connected to the ground wiring; and a second transistor formed in the substrate comprising the first diffusion region electrically connected to the first wiring, a third diffusion region electrically connected to the third wiring, and a gate electrically connected to the ground wiring, wherein, a first resistance value of a first current pathway leading from the first connecting point to the secon
    Type: Grant
    Filed: March 10, 2017
    Date of Patent: November 6, 2018
    Assignee: Toshiba Memory Corporation
    Inventors: Taichi Wakui, Yasuhiro Suematsu, Yuui Shimizu
  • Publication number: 20180254750
    Abstract: According to one embodiment, the amplifier circuit includes a first and second differential amplifier. The first differential amplifier includes first and second transistors, a first current source, and a second current source that is configured to supply a current to the first and second transistors via a first switch element. The second differential amplifier includes third and fourth transistors, a third current source, and a fourth current source that is configured to supply a current to the third and fourth transistors via a second switch element. A first signal is input to the first and third transistors. The first switch elements are controlled by third and fourth signals, respectively. The third signal and the fourth signal are complementary.
    Type: Application
    Filed: September 8, 2017
    Publication date: September 6, 2018
    Applicant: TOSHIBA MEMORY CORPORATION
    Inventors: Junya MATSUNO, Kazuyoshi MURAOKA, Masami MASUDA, Yuui SHIMIZU, Masatoshi KOHNO, Masahiro HOSOYA
  • Publication number: 20170345814
    Abstract: According to one embodiment, an electrostatic discharge semiconductor device includes one or more wiring layers first disposed over a substrate, including: a wiring electrically connected at a first connecting point of a pad, a second wiring electrically connected at a second connecting point of a ground wiring, and a third wiring electrically connected at a third connecting point of the ground wiring; a first transistor formed in the substrate comprising a first diffusion region electrically connected to the first wiring, a second diffusion region electrically connected to the second wiring, and a gate electrically connected to the ground wiring; and a second transistor formed in the substrate comprising the first diffusion region electrically connected to the first wiring, a third diffusion region electrically connected to the third wiring, and a gate electrically connected to the ground wiring, wherein, a first resistance value of a first current pathway leading from the first connecting point to the secon
    Type: Application
    Filed: March 10, 2017
    Publication date: November 30, 2017
    Inventors: Taichi Wakui, Yasuhiro Suematsu, Yuui Shimizu
  • Patent number: 9583582
    Abstract: According to one embodiment, a semiconductor integrated device includes a first node that receives a first voltage, a second node that receives a second voltage, and an electrode. A PMOS transistor is coupled between the first node and the electrode. An NMOS transistor is coupled between the second node and the electrode. A control signal at a voltage lower than the second voltage is supplied to a gate electrode of the PMOS transistor. A control signal at a voltage higher than the first voltage is supplied to a gate electrode of the NMOS transistor.
    Type: Grant
    Filed: September 5, 2014
    Date of Patent: February 28, 2017
    Assignee: Kabushiki Kaisha Toshiba
    Inventor: Yuui Shimizu
  • Patent number: 9367076
    Abstract: A semiconductor device comprises a plurality of semiconductor chips stacked on a substrate. The semiconductor chip comprises: an internal power supply voltage generating circuit that generates an internal power supply voltage based on an external power supply; a power supply line that supplies the internal power supply voltage; an internal power supply pad connected to the power supply line; and a stabilizing capacitance connected to the power supply line. The internal power supply pad is electrically short-circuited with the internal power supply pad included in another semiconductor chip.
    Type: Grant
    Filed: June 9, 2014
    Date of Patent: June 14, 2016
    Assignee: KABUSHIKI KAISHA TOSHIBA
    Inventors: Satoshi Inoue, Yuui Shimizu
  • Patent number: 9218859
    Abstract: A semiconductor memory device comprises: a plurality of on-die termination circuits connected to each of a plurality of input/output pads; and a control circuit for controlling the on-die termination circuit. The on-die termination circuit comprises: a pull-up element connected between a first terminal and an output terminal; and a pull-down element connected between the output terminal and a second terminal. The pull-up element is driven by a first pull-up element driver, and the pull-down element is driven by a first pull-down element driver. The control circuit activates a plurality of the on-die termination circuits at different timings.
    Type: Grant
    Filed: September 6, 2013
    Date of Patent: December 22, 2015
    Assignee: KABUSHIKI KAISHA TOSHIBA
    Inventors: Yuui Shimizu, Yasuhiro Suematsu
  • Publication number: 20150261245
    Abstract: A semiconductor device comprises a plurality of semiconductor chips stacked on a substrate. The semiconductor chip comprises: an internal power supply voltage generating circuit that generates an internal power supply voltage based on an external power supply; a power supply line that supplies the internal power supply voltage; an internal power supply pad connected to the power supply line; and a stabilizing capacitance connected to the power supply line. The internal power supply pad is electrically short-circuited with the internal power supply pad included in another semiconductor chip.
    Type: Application
    Filed: June 9, 2014
    Publication date: September 17, 2015
    Applicant: Kabushiki Kaisha Toshiba
    Inventors: Satoshi INOUE, Yuui SHIMIZU
  • Publication number: 20150256158
    Abstract: According to one embodiment, a semiconductor integrated device includes a first node that receives a first voltage, a second node that receives a second voltage, and an electrode. A PMOS transistor is coupled between the first node and the electrode. An NMOS transistor is coupled between the second node and the electrode. A control signal at a voltage lower than the second voltage is supplied to a gate electrode of the PMOS transistor. A control signal at a voltage higher than the first voltage is supplied to a gate electrode of the NMOS transistor.
    Type: Application
    Filed: September 5, 2014
    Publication date: September 10, 2015
    Applicant: Kabushiki Kaisha Toshiba
    Inventor: Yuui SHIMIZU
  • Patent number: 9076532
    Abstract: A semiconductor memory device comprises a first-supplied-voltage-supplying pad, a second-supplied-voltage-supplying pad, a data input/output pad, a memory body, a buffer circuit and an impedance-controlling circuit. A first supplied voltage is supplied to the memory body. A second supplied voltage is supplied to the buffer circuit. The impedance-controlling circuit controls an impedance of the buffer circuit on a side connected to the data input/output pad. The semiconductor memory device comprises a voltage-generating circuit generating a first inner voltage. The impedance-controlling circuit comprises a first P-channel transistor. A source terminal of the first P-channel transistor is connected to the first-supplied-voltage-supplying pad, and the first inner voltage generated from the voltage-generating circuit is selectively supplied to a gate terminal of the first P-channel transistor.
    Type: Grant
    Filed: September 9, 2013
    Date of Patent: July 7, 2015
    Assignee: KABUSHIKI KAISHA TOSHIBA
    Inventors: Yuui Shimizu, Satoshi Inoue
  • Patent number: 8861287
    Abstract: According to an embodiment, an interface circuit is provided with an output buffer which generates an output waveform on the basis of the ON/OFF operation of a transistor and a driver circuit which drives the transistor and is capable of independently changing a turn-ON speed and a turn-OFF speed of the transistor.
    Type: Grant
    Filed: September 14, 2012
    Date of Patent: October 14, 2014
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Yuui Shimizu, Masaru Koyanagi, Yasuhiro Suematsu
  • Publication number: 20140285231
    Abstract: According to one embodiment, a semiconductor device includes a termination circuit and a controller. The termination circuit includes a first resistor connected to an external connection terminal, a plurality of first transistors of a first conductive type connected in parallel between the first resistor and a voltage source, a second resistor connected to the external connection terminal, and a plurality of second transistors of a second conductive type connected in parallel between the second resistor and ground. The controller is configured to control switching of the first and second transistors such that a combined resistance value of the first and second resistors and the termination circuit is constant.
    Type: Application
    Filed: September 3, 2013
    Publication date: September 25, 2014
    Applicant: KABUSHIKI KAISHA TOSHIBA
    Inventors: Yasuhiro SUEMATSU, Masaru KOYANAGI, Satoshi INOUE, Yuui SHIMIZU