Patents by Inventor Tetsufumi Tanamoto

Tetsufumi Tanamoto 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: 20090179667
    Abstract: It is made possible to provide a reconfigurable logic circuit with which high integration can be achieved. A reconfigurable logic circuit includes: a multiplexer which includes a plurality of spin MOSFETs each having a source and drain containing a magnetic material, and a selecting portion including a plurality of MOSFETs and selecting a spin MOSFET from the plurality of spin MOSFETs, based on control data transmitted from control lines; a determining circuit which determines whether magnetization of the magnetic material of the source and drain of a selected spin MOSFET, which is selected by the selecting portion, is in a first state or in a second state; and a first and second write circuits which put the magnetization of the magnetic material of the source and drain of the selected spin MOSFET into the second and first states respectively by supplying a write current flowing between the source and drain of the selected spin MOSFET.
    Type: Application
    Filed: December 19, 2008
    Publication date: July 16, 2009
    Applicant: Kabushiki Kaisha Toshiba
    Inventors: Hideyuki SUGIYAMA, Mizue ISHIKAWA, Tomoaki INOKUCHI, Yoshiaki SAITO, Tetsufumi TANAMOTO
  • Patent number: 7558813
    Abstract: The objective is to provide a random number generating device having a smaller circuit size and a smaller value of output bias. The random number generating device includes a pair of first and second current paths arranged in parallel with each other, and a pair of first and second fine particles, which can mutually exchange charges, and are located in the vicinity of the first and second current paths.
    Type: Grant
    Filed: June 20, 2008
    Date of Patent: July 7, 2009
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Tetsufumi Tanamoto, Shinobu Fujita
  • Publication number: 20080256152
    Abstract: The objective is to provide a random number generating device having a smaller circuit size and a smaller value of output bias. The random number generating device includes a pair of first and second current paths arranged in parallel with each other, and a pair of first and second fine particles, which can mutually exchange charges, and are located in the vicinity of the first and second current paths.
    Type: Application
    Filed: June 20, 2008
    Publication date: October 16, 2008
    Applicant: Kabushiki Kaisha Toshiba
    Inventors: Tetsufumi Tanamoto, Shinobu Fujita
  • Publication number: 20080251783
    Abstract: The objective is to provide a random number generating device having a smaller circuit size and a smaller value of output bias. The random number generating device includes a pair of first and second current paths arranged in parallel with each other, and a pair of first and second fine particles, which can mutually exchange charges, and are located in the vicinity of the first and second current paths.
    Type: Application
    Filed: June 20, 2008
    Publication date: October 16, 2008
    Applicant: Kabushiki Kaisha Toshiba
    Inventors: Tetsufumi TANAMOTO, Shinobu Fujita
  • Publication number: 20080251782
    Abstract: The objective is to provide a random number generating device having a smaller circuit size and a smaller value of output bias. The random number generating device includes a pair of first and second current paths arranged in parallel with each other, and a pair of first and second fine particles, which can mutually exchange charges, and are located in the vicinity of the first and second current paths.
    Type: Application
    Filed: June 20, 2008
    Publication date: October 16, 2008
    Applicant: Kabushiki Kaisha Toshiba
    Inventors: Tetsufumi TANAMOTO, Shinobu FUJITA
  • Publication number: 20080243978
    Abstract: A random number generator includes an amplifier to amplify a difference between a noise signal and a reference signal to generate an amplified signal, a plurality of binarization circuits configured to binarize the amplified signal by using different inherent threshold values to obtain a plurality of binarized signals, and an exclusive OR circuit to perform an exclusive OR operation on the a plurality of binarized signals to generate random number sequence.
    Type: Application
    Filed: March 17, 2008
    Publication date: October 2, 2008
    Inventors: Shinichi Yasuda, Keiko Abe, Tetsufumi Tanamoto, Kumiko Nomura
  • Publication number: 20080244489
    Abstract: A method of designing a three-dimensional integrated circuit includes dividing two-dimensional layout data of a circuit formed on a semiconductor substrate into a plurality of layout block data in order to re-arrange in different layers, generating layout block data reversing one of the layout block data of two folded layers arranged vertically adjacent to each other, alternately arranging the reversed layout block data and non-reverse block layout data to form a plurality of layers vertically overlapped, selecting at least one from interconnects included in a plurality of layout block data of the circuit and ranging over plural layers so as to be mutually and functionally collected together with respect to at least one of time delay, interconnect length and block configuration, and re-arranging the selected interconnect using a via connecting an upper layer and an under layer of the folded interconnect.
    Type: Application
    Filed: March 13, 2008
    Publication date: October 2, 2008
    Inventors: Tetsufumi Tanamoto, Shinichi Yasuda, Shinobu Fujita
  • Patent number: 7405423
    Abstract: The objective is to provide a random number generating device having a smaller circuit size and a smaller value of output bias. The random number generating device includes a pair of first and second current paths arranged in parallel with each other, and a pair of first and second fine particles, which can mutually exchange charges, and are located in the vicinity of the first and second current paths.
    Type: Grant
    Filed: February 27, 2003
    Date of Patent: July 29, 2008
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Tetsufumi Tanamoto, Shinobu Fujita
  • Publication number: 20080046790
    Abstract: A random number test circuit includes a counting unit to count number of repetitions of a certain-value bit in a random number sequence, the repetitions occurring in series, a detecting unit to detect a plurality of numbers corresponding to a kind of bits in the random number sequence, and a determining unit to determine whether the random number sequence is normal, based on the numbers.
    Type: Application
    Filed: October 19, 2007
    Publication date: February 21, 2008
    Inventors: Shinichi Yasuda, Shinobu Fujita, Koichi Fujisaki, Tetsufumi Tanamoto, Keiko Abe
  • Publication number: 20070162806
    Abstract: The random number test circuit includes a shift register which operates based on a clock and which successively stores serial random numbers generated by a random number generation element, a first random number being output from a predetermined stage of the shift register; a comparison circuit which compares the first random number with a second random number located at a distance of a first predetermined number of bits from the first random number, the second random number being generated by the random number generation element; a counter which counts a frequency of occurrence of equality or inequality between the first random number and the second random number, with respect to all bits in the serial random numbers, and a decision circuit which judges an article quality to be good if a count value in the counter indicates a frequency of occurrence equal to or less than a number determined previously by correlation.
    Type: Application
    Filed: December 8, 2006
    Publication date: July 12, 2007
    Inventors: Mari Matsumoto, Tetsufumi Tanamoto, Shinobu Fujita
  • Patent number: 7001787
    Abstract: An electrode manufacturing method comprises: forming plural protruding portions on a surface of a substrate; introducing first particles having a size that changes according to heat, light, or a first solvent between said plural protruding portions; changing the size of the first particles by applying heat, light, or the first solvent to said first particles; and depositing an electrode material onto the surface of said substrate.
    Type: Grant
    Filed: July 30, 2004
    Date of Patent: February 21, 2006
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Tetsufumi Tanamoto, Satoshi Saito, Shinobu Fujita
  • Publication number: 20050204220
    Abstract: A random number test circuit includes a counting unit to count number of repetitions of a certain-value bit in a random number sequence, the repetitions occurring in series, a detecting unit to detect a plurality of numbers corresponding to a kind of bits in the random number sequence, and a determining unit to determine whether the random number sequence is normal, based on the numbers.
    Type: Application
    Filed: March 1, 2005
    Publication date: September 15, 2005
    Inventors: Shinichi Yasuda, Shinobu Fujita, Koichi Fujisaki, Tetsufumi Tanamoto, Keiko Abe
  • Publication number: 20050026411
    Abstract: An electrode manufacturing method comprises: forming plural protruding portions on a surface of a substrate; introducing first particles having a size that changes according to heat, light, or a first solvent between said plural protruding portions; changing the size of the first particles by applying heat, light, or the first solvent to said first particles; and depositing an electrode material onto the surface of said substrate.
    Type: Application
    Filed: July 30, 2004
    Publication date: February 3, 2005
    Inventors: Tetsufumi Tanamoto, Satoshi Saito, Shinobu Fujita
  • Patent number: 6800837
    Abstract: Physical systems, each having three energy levels, in the solid substance arranged in a resonator are provided in which two of three transitions are optically allowed and a qubit is expressed by either of quantum states of two levels constituting the remaining optically forbidden transition or by the superposition state thereof. Two physical systems selectively irradiated with two kinds of light, frequency difference thereof corresponding to a transition frequency of the optically forbidden transition for respective physical systems, thereby setting initial states. A two-qubit gate operation is performed by irradiating the two physical systems simultaneously with two kinds of light having frequencies resonant with the optically allowed transitions other than the transitions coupled through the common resonator mode, while increasing an intensity level of one of the two kinds of light and decreasing an intensity level of the other light between start time and finish time of the simultaneous irradiation.
    Type: Grant
    Filed: November 17, 2000
    Date of Patent: October 5, 2004
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Kouichi Ichimura, Tetsufumi Tanamoto
  • Publication number: 20030162587
    Abstract: The objective is to provide a random number generating device having a smaller circuit size and a smaller value of output bias. The random number generating device includes a pair of first and second current paths arranged in parallel with each other, and a pair of first and second fine particles, which can mutually exchange charges, and are located in the vicinity of the first and second current paths.
    Type: Application
    Filed: February 27, 2003
    Publication date: August 28, 2003
    Applicant: Kabushiki Kaisha Toshiba
    Inventors: Tetsufumi Tanamoto, Shinobu Fujita
  • Patent number: 6333516
    Abstract: An inverter comprising four quantum dot cells. When the quantum dot cells are arranged in 9 o'clock direction, 12 o'clock direction and 3 o'clock direction, the quantum dot cell is arranged in 6 o'clock direction.
    Type: Grant
    Filed: December 12, 1996
    Date of Patent: December 25, 2001
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Riichi Katoh, Tetsufumi Tanamoto, Francis Minoru Saba, Yujiro Naruse, Shigeki Takahashi, Masao Mashita
  • Patent number: 6208000
    Abstract: A semiconductor device according to the invention is constructed as below. A charge accumulating layer which contains a magnetic substance is formed directly on a semiconductor substrate, and a gate insulating film is formed on the charge accumulating layer. Further, a gate electrode is formed on the gate insulating film, and source and drain regions formed in surface portions of the semiconductor substrate such that the gate electrode is interposed therebetween. Another semiconductor device according to the invention is constructed as below. A first gate insulating film formed on a semiconductor substrate, and a charge accumulating layer which contains a magnetic substance is formed on the first gate insulating film. Further, a second gate insulating film is formed on the charge accumulating layer, and a gate electrode is formed on the second gate insulating film. Source and drain regions formed in surface portions of the semiconductor substrate such that the gate electrode is interposed therebetween.
    Type: Grant
    Filed: May 4, 1999
    Date of Patent: March 27, 2001
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Tetsufumi Tanamoto, Shinobu Fujita, Koichiro Inomata
  • Patent number: 6060743
    Abstract: The semiconductor device comprises a first insulating layer formed on the semiconductor substrate, at least one double-deck semiconductor nanocrystal formed on the first insulating layer, the at least one double-deck semiconductor nanocrystal comprising a first semiconductor nanocrystal and a second semiconductor nanocrystal stacked one upon the other via a second insulating layer, and a third insulating layer selectively formed on the first insulating layer so as to cover the at least one double-deck semiconductor nanocrystal.
    Type: Grant
    Filed: May 20, 1998
    Date of Patent: May 9, 2000
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Naoharu Sugiyama, Tsutomu Tezuka, Riichi Katoh, Atsushi Kurobe, Tetsufumi Tanamoto
  • Patent number: 5877511
    Abstract: A single-electron controlling magnetoresistance element which comprises, a couple of first ferromagnetic bodies each magnetized in a first direction, a second ferromagnetic body magnetized in a second direction in an initial direction and sandwiched between the couple of first ferromagnetic bodies with a tunnel junction interposed therebetween respectively, and means for directing the magnetization direction of the second ferromagnetic body to a direction different from the second direction, wherein a charging energy E.sub.c of a single electron in at least one of the tunnel junctions interposed between the first ferromagnetic body and the second ferromagnetic body meets the following conditions:E.sub.c >>k.sub.B T (2)E.sub.c >>h/R.sub.t C (3)wherein k.sub.B T is a thermal energy at an operation temperature, h is a Planck's constant, R.sub.t is a junction tunnel resistance, and C is a junction capacity.
    Type: Grant
    Filed: September 29, 1997
    Date of Patent: March 2, 1999
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Tetsufumi Tanamoto, Shuichi Iwabuchi
  • Patent number: 5844279
    Abstract: A semiconductor device which includes, a substrate, an insulating layer formed on the substrate, a silicon layer having an exposed surface constituted by a Si (100) face, the silicon layer being provided with a tapered recess having a bottom at which a part of the silicon layer is remained without exposing the insulating layer, a first conductive region constituted by the silicon layer remaining at the bottom of the tapered recess, a second and a third conductive regions formed on both sides of the tapered recess respectively, a first insulating film formed on an inner surface of the tapered recess, and an electrode formed in the tapered recess. A flow of electron resulting from the tunneling effect from the second conductive region via the first insulating film to the third conductive region is controlled by controlling a voltage to be impressed onto the electrode.
    Type: Grant
    Filed: September 13, 1996
    Date of Patent: December 1, 1998
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Tetsufumi Tanamoto, Riichi Katoh