Patents by Inventor Satoshi Iwahashi

Satoshi Iwahashi 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: 20230253473
    Abstract: A method of manufacturing a semiconductor device having a super junction structure, includes: forming a first-conductivity-type semiconductor layer having a first surface and a second surface opposite to the first surface; forming a second-conductivity-type pillar region in the semiconductor layer; forming an insulating layer which covers the second surface of the semiconductor layer; forming a metal layer on the insulating layer; forming a gate electrode including a first opening passing through the metal layer by selectively removing the metal layer; and etching the insulating layer via the first opening, wherein the etching the insulating layer includes partially exposing the semiconductor layer by forming a second opening having a curved sidewall in the insulating layer by isotropic etching, and wherein an exposed surface of the semiconductor layer forms a flat surface continuous with the second surface of the semiconductor layer covered with the insulating layer.
    Type: Application
    Filed: January 5, 2023
    Publication date: August 10, 2023
    Applicant: ROHM CO., LTD.
    Inventors: So NAGAKURA, Jun KOBAYASHI, Satoshi IWAHASHI, Kazuyoshi MAKI, Shu NAKASHIMA
  • Publication number: 20230246105
    Abstract: A semiconductor device includes a semiconductor layer that has a first main surface at one side and a second main surface at another side, a plurality of gate electrodes that are arranged at intervals on the first main surface of the semiconductor layer, an interlayer insulating film that is formed on the first main surface of the semiconductor layer such as to cover the gate electrodes, an electrode film that is formed on the interlayer insulating film, and a plurality of tungsten plugs that, between a pair of the gate electrodes that are mutually adjacent, are respectively embedded in a plurality of contact openings formed in the interlayer insulating film at intervals in a direction in which the pair of mutually adjacent gate electrodes face each other and each have a bottom portion contacting the semiconductor layer and a top portion contacting the electrode film.
    Type: Application
    Filed: March 28, 2023
    Publication date: August 3, 2023
    Inventors: So NAGAKURA, Satoshi IWAHASHI
  • Patent number: 11646370
    Abstract: A semiconductor device includes a semiconductor layer that has a first main surface at one side and a second main surface at another side, a plurality of gate electrodes that are arranged at intervals on the first main surface of the semiconductor layer, an interlayer insulating film that is formed on the first main surface of the semiconductor layer such as to cover the gate electrodes, an electrode film that is formed on the interlayer insulating film, and a plurality of tungsten plugs that, between a pair of the gate electrodes that are mutually adjacent, are respectively embedded in a plurality of contact openings formed in the interlayer insulating film at intervals in a direction in which the pair of mutually adjacent gate electrodes face each other and each have a bottom portion contacting the semiconductor layer and a top portion contacting the electrode film.
    Type: Grant
    Filed: November 12, 2021
    Date of Patent: May 9, 2023
    Assignee: ROHM CO., LTD.
    Inventors: So Nagakura, Satoshi Iwahashi
  • Publication number: 20220069121
    Abstract: A semiconductor device includes a semiconductor layer that has a first main surface at one side and a second main surface at another side, a plurality of gate electrodes that are arranged at intervals on the first main surface of the semiconductor layer, an interlayer insulating film that is formed on the first main surface of the semiconductor layer such as to cover the gate electrodes, an electrode film that is formed on the interlayer insulating film, and a plurality of tungsten plugs that, between a pair of the gate electrodes that are mutually adjacent, are respectively embedded in a plurality of contact openings formed in the interlayer insulating film at intervals in a direction in which the pair of mutually adjacent gate electrodes face each other and each have a bottom portion contacting the semiconductor layer and a top portion contacting the electrode film.
    Type: Application
    Filed: November 12, 2021
    Publication date: March 3, 2022
    Inventors: So NAGAKURA, Satoshi IWAHASHI
  • Patent number: 11205720
    Abstract: A semiconductor device includes a semiconductor layer that has a first main surface at one side and a second main surface at another side, a plurality of gate electrodes that are arranged at intervals on the first main surface of the semiconductor layer, an interlayer insulating film that is formed on the first main surface of the semiconductor layer such as to cover the gate electrodes, an electrode film that is formed on the interlayer insulating film, and a plurality of tungsten plugs that, between a pair of the gate electrodes that are mutually adjacent, are respectively embedded in a plurality of contact openings formed in the interlayer insulating film at intervals in a direction in which the pair of mutually adjacent gate electrodes face each other and each have a bottom portion contacting the semiconductor layer and a top portion contacting the electrode film.
    Type: Grant
    Filed: May 28, 2020
    Date of Patent: December 21, 2021
    Assignee: ROHM CO., LTD.
    Inventors: So Nagakura, Satoshi Iwahashi
  • Publication number: 20200381551
    Abstract: A semiconductor device includes a semiconductor layer that has a first main surface at one side and a second main surface at another side, a plurality of gate electrodes that are arranged at intervals on the first main surface of the semiconductor layer, an interlayer insulating film that is formed on the first main surface of the semiconductor layer such as to cover the gate electrodes, an electrode film that is formed on the interlayer insulating film, and a plurality of tungsten plugs that, between a pair of the gate electrodes that are mutually adjacent, are respectively embedded in a plurality of contact openings formed in the interlayer insulating film at intervals in a direction in which the pair of mutually adjacent gate electrodes face each other and each have a bottom portion contacting the semiconductor layer and a top portion contacting the electrode film.
    Type: Application
    Filed: May 28, 2020
    Publication date: December 3, 2020
    Inventors: So NAGAKURA, Satoshi IWAHASHI
  • Patent number: 7012848
    Abstract: The present invention provides a novel semiconductor integrated circuit device equipped with memory circuits, high-speed memories and large memory capacity memory circuits, which enables speeding up and facilitation of timing settings.
    Type: Grant
    Filed: August 13, 2004
    Date of Patent: March 14, 2006
    Assignee: Renesas Technology Corporation
    Inventors: Satoshi Iwahashi, Shigeru Nakahara, Takeshi Suzuki, Keiichi Higeta
  • Patent number: 7009862
    Abstract: Data lines (D0, D1) are shared by a first storage portion (MA) and a second storage portion (MB), and furthermore, a first transistor (MC0) coupled to a first comparison data portion (CD0) and a second transistor (MCA) coupled to the storage node of a first storage portion are connected in series to form a first comparing circuit (11), and a third transistor (MC1) coupled to a second comparison data line (CD1) and a fourth transistor (MCB) coupled to the storage node of the second storage portion are connected in series to form a second comparing circuit (12). Consequently, it is possible to enhance a symmetry in the layout of a diffusion layer and a wiring layer and to achieve the easiness of a layout in which a memory cell is line symmetrical with respect to a center line passing through a center thereof. Thus, a manufacturing process condition can easily be optimized and a variation in a manufacturing process can be reduced so that the microfabrication of the memory cell can be achieved.
    Type: Grant
    Filed: December 15, 2004
    Date of Patent: March 7, 2006
    Assignee: Hitachi, Ltd.
    Inventors: Keiichi Higeta, Satoshi Iwahashi, Yoichiro Aihara, Shigeru Nakahara
  • Publication number: 20050146947
    Abstract: Data lines (D0, D1) are shared by a first storage portion (MA) and a second storage portion (MB), and furthermore, a first transistor (MC0) coupled to a first comparison data portion (CD0) and a second transistor (MCA) coupled to the storage node of a first storage portion are connected in series to form a first comparing circuit (11), and a third transistor (MC1) coupled to a second comparison data line (CD1) and a fourth transistor (MCB) coupled to the storage node of the second storage portion are connected in series to form a second comparing circuit (12). Consequently, it is possible to enhance a symmetry in the layout of a diffusion layer and a wiring layer and to achieve the easiness of a layout in which a memory cell is line symmetrical with respect to a center line passing through a center thereof. Thus, a manufacturing process condition can easily be optimized and a variation in a manufacturing process can be reduced so that the microfabrication of the memory cell can be achieved.
    Type: Application
    Filed: December 15, 2004
    Publication date: July 7, 2005
    Inventors: Keiichi Higeta, Satoshi Iwahashi, Yoichiro Aihara, Shigeru Nakahara
  • Patent number: 6856574
    Abstract: A semiconductor memory device comprises a memory-cell array for storing data, a peripheral circuit for carrying out an operation to read out or write data from or into the memory-cell array, read clock generation circuits (111, 113 and 115) each used for generating a read clock signal to be supplied to the peripheral circuit in the operation to read out data from the memory-cell array, write clock generation circuits (112, 114 and 116) each used for generating a write clock signal to be supplied to the peripheral circuit in the operation to write data into the memory-cell array. Since the pulse widths of the clock signals in read and writes are adjusted individually, margin insufficiencies of the pulse widths can be evaluated and results of the evaluation can be fed back to a design phase for, among other purposes, correction of a layout.
    Type: Grant
    Filed: November 25, 2003
    Date of Patent: February 15, 2005
    Assignee: Hitachi, Ltd.
    Inventors: Satoshi Iwahashi, Keiichi Higeta
  • Publication number: 20050013159
    Abstract: The present invention provides a novel semiconductor integrated circuit device equipped with memory circuits, high-speed memories and large memory capacity memory circuits, which enables speeding up and facilitation of timing settings.
    Type: Application
    Filed: August 13, 2004
    Publication date: January 20, 2005
    Inventors: Satoshi Iwahashi, Shigeru Nakahara, Takeshi Suzuki, Keiichi Higeta
  • Patent number: 6826109
    Abstract: The invention provides a semiconductor integrated circuit device on which a RAM macro capable of selecting an operation mode adapted to improved ease of use, response, or low power consumption or selecting an input setup value is mounted. In a first operation mode of a RAM macro, a timing of receiving an input signal is set as a first timing. In a second operation mode, a timing of receiving an input signal is set to a second timing later than the first timing. In a semiconductor integrated circuit device including an input circuit for receiving an input signal and a decoder circuit for decoding an output signal of the input circuit, the input circuit is activated on the basis of a first signal and the decoder circuit is activated on the basis of a second signal.
    Type: Grant
    Filed: January 16, 2003
    Date of Patent: November 30, 2004
    Assignee: Hitachi, Ltd.
    Inventors: Shigeru Nakahara, Satoshi Iwahashi, Takeshi Suzuki, Keiichi Higeta, Kazuo Kanetani
  • Patent number: 6795368
    Abstract: The present invention provides a novel semiconductor integrated circuit device equipped with memory circuits, high-speed memories and large memory capacity memory circuits, which enables speeding up and facilitation of timing settings.
    Type: Grant
    Filed: December 15, 2003
    Date of Patent: September 21, 2004
    Assignee: Renesas Technology Corp.
    Inventors: Satoshi Iwahashi, Shigeru Nakahara, Takeshi Suzuki, Keiichi Higeta
  • Publication number: 20040125683
    Abstract: The present invention provides a novel semiconductor integrated circuit device equipped with memory circuits, high-speed memories and large memory capacity memory circuits, which enables speeding up and facilitation of timing settings.
    Type: Application
    Filed: December 15, 2003
    Publication date: July 1, 2004
    Applicant: Renesas Technology Corporation
    Inventors: Satoshi Iwahashi, Shigeru Nakahara, Takeshi Suzuki, Keiichi Hegeta
  • Publication number: 20040105339
    Abstract: A semiconductor memory device comprises a memory-cell array for storing data, a peripheral circuit for carrying out an operation to read out or write data from or into the memory-cell array, read clock generation circuits (111, 113 and 115) each used for generating a read clock signal to be supplied to the peripheral circuit in the operation to read out data from the memory-cell array, write clock generation circuits (112, 114 and 116) each used for generating a write clock signal to be supplied to the peripheral circuit in the operation to write data into the memory-cell array. Since the pulse widths of the clock signals in read and writes are adjusted individually, margin insufficiencies of the pulse widths can be evaluated and results of the evaluation can be fed back to a design phase for, among other purposes, correction of a layout.
    Type: Application
    Filed: November 25, 2003
    Publication date: June 3, 2004
    Inventors: Satoshi Iwahashi, Keiichi Higeta
  • Patent number: 6707751
    Abstract: The present invention provides a novel semiconductor integrated circuit device equipped with memory circuits, high-speed memories and large memory capacity memory circuits, which enables speeding up and facilitation of timing settings.
    Type: Grant
    Filed: January 10, 2003
    Date of Patent: March 16, 2004
    Assignee: Renesas Technology Corporation
    Inventors: Satoshi Iwahashi, Shigeru Nakahara, Takeshi Suzuki, Keiichi Higeta
  • Publication number: 20030142576
    Abstract: The present invention provides a novel semiconductor integrated circuit device equipped with memory circuits, high-speed memories and large memory capacity memory circuits, which enables speeding up and facilitation of timing settings.
    Type: Application
    Filed: January 10, 2003
    Publication date: July 31, 2003
    Applicant: Hitachi, ltd.
    Inventors: Satoshi Iwahashi, Shigeru Nakahara, Takeshi Suzuki, Keiichi Higeta
  • Publication number: 20030142526
    Abstract: The invention provides a semiconductor integrated circuit device on which a RAM macro capable of selecting an operation mode adapted to improved ease of use, response, or low power consumption or selecting an input setup value is mounted. In a first operation mode of a RAM macro, a timing of receiving an input signal is set as a first timing. In a second operation mode, a timing of receiving an input signal is set to a second timing later than the first timing. In a semiconductor integrated circuit device including an input circuit for receiving an input signal and a decoder circuit for decoding an output signal of the input circuit, the input circuit is activated on the basis of a first signal and the decoder circuit is activated on the basis of a second signal.
    Type: Application
    Filed: January 16, 2003
    Publication date: July 31, 2003
    Applicant: Hitachi, Ltd.
    Inventors: Shigeru Nakahara, Satoshi Iwahashi, Takeshi Suzuki, Keiichi Higeta, Kazuo Kanetani