Patents by Inventor Motoshige Igarashi

Motoshige Igarashi 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: 20060175679
    Abstract: A semiconductor device of the invention has a plurality of resistor elements formed on an element isolating oxide film in predetermined regions on a surface of a semiconductor substrate. Active regions are furnished close to the resistor elements. This allows the element isolating oxide film near the resistor elements to be divided into suitable strips, forestalling a concave formation at the center of the element isolating oxide film upon polishing of the film by CMP and thereby enhancing dimensional accuracy of the resistor elements upon fabrication.
    Type: Application
    Filed: March 21, 2006
    Publication date: August 10, 2006
    Applicant: Renesas Technology Corp.
    Inventors: Hiroyuki Amishiro, Toshio Kumamoto, Motoshige Igarashi, Kenji Yamaguchi
  • Patent number: 7045865
    Abstract: A semiconductor device of the invention has a plurality of resistor elements formed on an element isolating oxide film in predetermined regions on a surface of a semiconductor substrate. Active regions are furnished close to the resistor elements. This allows the element isolating oxide film near the resistor elements to be divided into suitable strips, forestalling a concave formation at the center of the element isolating oxide film upon polishing of the film by CMP and thereby enhancing dimensional accuracy of the resistor elements upon fabrication.
    Type: Grant
    Filed: September 24, 2001
    Date of Patent: May 16, 2006
    Assignee: Renesas Technology Corp.
    Inventors: Hiroyuki Amishiro, Toshio Kumamoto, Motoshige Igarashi, Kenji Yamaguchi
  • Publication number: 20050112832
    Abstract: A thermal process for activating respective impurities in a polysilicon film to be a gate electrode and a resistance element is performed with the polysilicon film to be the gate electrode and the resistance element being coated with an oxide film, after the respective impurities are implanted into the polysilicon film to be the gate electrode and the resistance element. Here, concentrations of the respective impurities in the polysilicon film to be the gate electrode and the resistance element are adjusted by controlling the thickness of the oxide film. The degree of impurity activation is thereby adjusted.
    Type: Application
    Filed: November 8, 2004
    Publication date: May 26, 2005
    Applicant: RENESAS TECHNOLOGY CORP.
    Inventors: Hiroshi Kawashima, Motoshige Igarashi, Keiichi Higashitani
  • Publication number: 20050062099
    Abstract: A semiconductor device and a manufacturing method thereof permitting the quality of gate insulating films to be prevented from deteriorating and thereby permitting electrical characteristics of the device to be prevented from deteriorating are provided. In a semiconductor device including a plurality of field effect transistors, an oxidation protection film 21 is formed on a side of one gate electrode 19.
    Type: Application
    Filed: November 5, 2004
    Publication date: March 24, 2005
    Applicant: MITSUBISHI DENKI KABUSHIKI KAISHA
    Inventors: Kenji Yoshiyama, Motoshige Igarashi, Keiichi Yamada, Katsuya Okada, Keiichi Higashitani
  • Patent number: 6853030
    Abstract: A semiconductor device and a manufacturing method thereof permitting the quality of gate insulating films to be prevented from deteriorating and thereby permitting electrical characteristics of the device to be prevented from deteriorating are provided. In a semiconductor device including a plurality of field effect transistors, an oxidation protection film 21 is formed on a side of one gate electrode 19.
    Type: Grant
    Filed: February 24, 2003
    Date of Patent: February 8, 2005
    Assignee: Renesas Technology Corp.
    Inventors: Kenji Yoshiyama, Motoshige Igarashi, Keiichi Yamada, Katsuya Okada, Keiichi Higashitani
  • Patent number: 6841459
    Abstract: A thermal process for activating respective impurities in a polysilicon film to be a gate electrode and a resistance element is performed with the polysilicon film to be the gate electrode and the resistance element being coated with an oxide film, after the respective impurities are implanted into the polysilicon film to be the gate electrode and the resistance element. Here, concentrations of the respective impurities in the polysilicon film to be the gate electrode and the resistance element are adjusted by controlling the thickness of the oxide film. The degree of impurity activation is thereby adjusted.
    Type: Grant
    Filed: November 6, 2002
    Date of Patent: January 11, 2005
    Assignee: Renesas Technology Corp.
    Inventors: Hiroshi Kawashima, Motoshige Igarashi, Keiichi Higashitani
  • Patent number: 6838777
    Abstract: Gate electrodes (3) are formed on a semiconductor substrate (1), each with a gate insulating film (2) interposed therebetween. A pair of offset spacers (4) are respectively formed on opposite side faces of each of the gate insulating film (2) and the gate electrodes (3). Diffusion layers (5) are formed in the semiconductor substrate (1) on opposite sides of a portion of the semiconductor substrate (1) immediately under each of the gate electrodes (3), by ion implantation.
    Type: Grant
    Filed: August 27, 2003
    Date of Patent: January 4, 2005
    Assignee: Renesas Technology Corp.
    Inventor: Motoshige Igarashi
  • Patent number: 6838732
    Abstract: To provide a semiconductor device with reduced parasitic capacity in the vicinity of gate electrodes, and a method for manufacturing such a semiconductor device. The semiconductor device comprises a gate electrode formed on a silicon semiconductor substrate 1 through a gate oxide film, and a pair of impurity diffusion layers formed on the surface region of the silicon semiconductor substrate at both sides of the gate electrode. A silicon nitride film acting as a sidewall spacer is formed so as to cover the sidewall of the gate electrode, and the silicon nitride film is allowed to extend to the surface of the silicon semiconductor substrate 1 in the vicinity of the gate electrode in a substantially L-shaped profile.
    Type: Grant
    Filed: October 9, 2001
    Date of Patent: January 4, 2005
    Assignee: Renesas Technology Corp.
    Inventors: Motoshige Igarashi, Hiroyuki Amishiro
  • Patent number: 6835647
    Abstract: A semiconductor device including an interconnection structure having superior electrical characteristics and allowing higher speed of operation and lower power consumption even when miniaturized, manufacturing method thereof and a method of designing a semiconductor circuit used in the manufacturing method are provided. In the semiconductor device, a conductive region is formed on a main surface of a semiconductor substrate. A first interconnection layer is electrically connected to the conductive region, has a relatively short line length, and contains a material having relatively high electrical resistance. A first insulator is formed to surround the first interconnection layer and has a relatively low dielectric constant. A second interconnection layer is formed on the main surface of the semiconductor substrate, contains a material having low electrical resistance than the material contained in the first interconnection layer, and has longer line length than the first interconnection layer.
    Type: Grant
    Filed: March 7, 2003
    Date of Patent: December 28, 2004
    Assignee: Renesas Technology Corp.
    Inventors: Hiroyuki Amishiro, Motoshige Igarashi
  • Patent number: 6818932
    Abstract: There is provided a semiconductor device including a transistor formed by means of a common contact hole that connects a gate electrode, and a diffused layer forming a source/drain terminal; and a semiconductor device comprising the gate electrode of the transistor, and a connecting terminal to which capacitance between substrates and capacitance between the gate electrode and the source/drain terminal are added, thereby improving the soft error resistance caused by alpha rays and neutron beams.
    Type: Grant
    Filed: December 6, 2001
    Date of Patent: November 16, 2004
    Assignee: Renesas Technology Corp.
    Inventors: Koji Nii, Motoshige Igarashi
  • Patent number: 6815839
    Abstract: The semiconductor memory device includes two PMOS transistors that make the SRAM memory cell. The gate insulating films of these PMOS transistors are formed using a material that has a high permittivity. As a result, the capacitance of memory nodes is increased, and the probability of soft errors is lowered.
    Type: Grant
    Filed: September 24, 2003
    Date of Patent: November 9, 2004
    Assignee: Renesas Technology Corp.
    Inventors: Koji Nii, Motoshige Igarashi
  • Publication number: 20040207098
    Abstract: Gate electrodes (3) are formed on a semiconductor substrate (1), each with a gate insulating film (2) interposed therebetween. A pair of offset spacers (4) are respectively formed on opposite side faces of each of the gate insulating film (2) and the gate electrodes (3). Diffusion layers (5) are formed in the semiconductor substrate (1) on opposite sides of a portion of the semiconductor substrate (1) immediately under each of the gate electrodes (3), by ion implantation.
    Type: Application
    Filed: August 27, 2003
    Publication date: October 21, 2004
    Applicant: Renesas Technology Corp.
    Inventor: Motoshige Igarashi
  • Publication number: 20040171225
    Abstract: A gate insulating film is formed on a semiconductor substrate, and a gate electrode is formed by deposition of semiconductor material on the gate insulating film. An amorphous layer is then formed along the surface of or inside the gate electrode, and side walls are formed on the gate electrode. Finally, impurities are implanted into the semiconductor substrate by ion implantation while the gate electrode and the side walls are used as masks.
    Type: Application
    Filed: March 9, 2004
    Publication date: September 2, 2004
    Applicant: RENESAS TECHNOLOGY CORP.
    Inventor: Motoshige Igarashi
  • Patent number: 6753246
    Abstract: The semiconductor device includes a semiconductor substrate and, in an element isolating region in the semiconductor substrate, a first active area A/A dummy pattern and a second A/A dummy pattern having a pitch smaller than that of the first A/A dummy pattern. Placement of the first A/A dummy pattern and placement of the second A/A dummy pattern are carried out in separate steps. The semiconductor substrate may be divided into a plurality of mesh regions, and a dummy pattern may be placed in each mesh region according to an area of the mesh region being occupied by an element pattern located therein.
    Type: Grant
    Filed: April 22, 2003
    Date of Patent: June 22, 2004
    Assignee: Renesas Technology Corp.
    Inventors: Hiroshi Kawashima, Masakazu Okada, Takeshi Kitani, Motoshige Igarashi
  • Patent number: 6730976
    Abstract: A transistor which has a stable characteristic and which can prevent tilted ions from penetrating through a grain boundary to a channel region when ions are implanted at an angle so as to form impurity layers while a gate electrode is used as a mask. A gate electrode comprises a two-layer structure of a lower film and an upper film formed on a gate insulation film on the surface of a semiconductor substrate. The thickness of the lower film is made greater than the range of ions in the thickness wise direction in the film when the ions are implanted to the sidewalls of the lower film.
    Type: Grant
    Filed: December 18, 1998
    Date of Patent: May 4, 2004
    Assignee: Renesas Technology Corp.
    Inventors: Akihiko Harada, Motoshige Igarashi
  • Patent number: 6720626
    Abstract: A gate insulating film is formed on a semiconductor substrate, and a gate electrode is formed by deposition of semiconductor material on the gate insulating film. An amorphous layer is then formed along the surface of or inside the gate electrode, and side walls are formed on the gate electrode. Finally, impurities are implanted into the semiconductor substrate by ion implantation while the gate electrode and the side walls are used as masks.
    Type: Grant
    Filed: July 14, 1998
    Date of Patent: April 13, 2004
    Assignee: Renesas Technology Corp.
    Inventor: Motoshige Igarashi
  • Publication number: 20040056278
    Abstract: The semiconductor memory device includes two PMOS transistors that make the SRAM memory cell. The gate insulating films of these PMOS transistors are formed using a material that has a high permittivity. As a result, the capacitance of memory nodes is increased, and the probability of soft errors is lowered.
    Type: Application
    Filed: September 24, 2003
    Publication date: March 25, 2004
    Applicant: Mitsubishi Denki Kabushiki Kaisha
    Inventors: Koji Nii, Motoshige Igarashi
  • Patent number: 6693820
    Abstract: The semiconductor memory device includes two PMOS transistors that make the SRAM memory cell. The gate insulating films of these PMOS transistors are formed using a material that has a high permittivity. As a result, the capacitance of memory nodes is increased, and the probability of soft errors is lowered.
    Type: Grant
    Filed: February 4, 2002
    Date of Patent: February 17, 2004
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventors: Koji Nii, Motoshige Igarashi
  • Patent number: 6683351
    Abstract: A semiconductor device restricting the antenna effect without complicating the manufacturing process and a manufacturing method of such a semiconductor device are provided. In addition, a semiconductor device ensuring matching or equality in characteristics of pairing transistors and a manufacturing method of such a semiconductor device are provided. The semiconductor device includes an interconnection that is placed on an insulating film covering a gate electrode and a semiconductor substrate and is electrically connected to the gate electrode. The semiconductor device also includes a dummy transistor that is formed on the semiconductor substrate and is unprovided with an interconnection required for a transistor. The interconnection is electrically connected to a source/drain region of the dummy transistor.
    Type: Grant
    Filed: August 22, 2002
    Date of Patent: January 27, 2004
    Assignee: Renesas Technology Corp.
    Inventors: Kiyoaki Morita, Motoshige Igarashi
  • Publication number: 20030216015
    Abstract: A thermal process for activating respective impurities in a polysilicon film to be a gate electrode and a resistance element is performed with the polysilicon film to be the gate electrode and the resistance element being coated with an oxide film, after the respective impurities are implanted into the polysilicon film to be the gate electrode and the resistance element. Here, concentrations of the respective impurities in the polysilicon film to be the gate electrode and the resistance element are adjusted by controlling the thickness of the oxide film. The degree of impurity activation is thereby adjusted.
    Type: Application
    Filed: November 6, 2002
    Publication date: November 20, 2003
    Applicant: MITSUBISHI DENKI KABUSHIKI KAISHA
    Inventors: Hiroshi Kawashima, Motoshige Igarashi, Keiichi Higashitani