Patents by Inventor Yohei Akita

Yohei Akita 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: 9647654
    Abstract: A monitor circuit includes a reference voltage generating unit that generates first and second reference voltages, a first amplifier unit that amplifies a differential voltage between the first reference voltage and the second reference voltage, a second amplifier unit that amplifies a differential voltage between an internal power supply voltage being supplied to a functional block provided in the semiconductor integrated circuit and the first reference voltage, and a comparator unit that compares an amplification result of the first amplifier unit with an amplification result of the second amplifier unit and outputs a comparison result as a measurement result.
    Type: Grant
    Filed: September 11, 2015
    Date of Patent: May 9, 2017
    Assignee: Renesas Electronics Corporation
    Inventors: Tadashi Kameyama, Takanobu Naruse, Yohei Akita, Hirotaka Hara
  • Publication number: 20160006424
    Abstract: A monitor circuit includes a reference voltage generating unit that generates first and second reference voltages, a first amplifier unit that amplifies a differential voltage between the first reference voltage and the second reference voltage, a second amplifier unit that amplifies a differential voltage between an internal power supply voltage being supplied to a functional block provided in the semiconductor integrated circuit and the first reference voltage, and a comparator unit that compares an amplification result of the first amplifier unit with an amplification result of the second amplifier unit and outputs a comparison result as a measurement result.
    Type: Application
    Filed: September 11, 2015
    Publication date: January 7, 2016
    Inventors: Tadashi Kameyama, Takanobu Naruse, Yohei Akita, Hirotaka Hara
  • Patent number: 9146598
    Abstract: A monitor circuit includes a reference voltage generating unit that generates first and second reference voltages, a first amplifier unit that amplifies a differential voltage between the first reference voltage and the second reference voltage, a second amplifier unit that amplifies a differential voltage between an internal power supply voltage being supplied to a functional block provided in the semiconductor integrated circuit and the first reference voltage, and a comparator unit that compares an amplification result of the first amplifier unit with an amplification result of the second amplifier unit and outputs a comparison result as a measurement result.
    Type: Grant
    Filed: January 28, 2014
    Date of Patent: September 29, 2015
    Assignee: Renesas Electronics Corporation
    Inventors: Tadashi Kameyama, Takanobu Naruse, Yohei Akita, Hirotaka Hara
  • Publication number: 20140210544
    Abstract: A monitor circuit includes a reference voltage generating unit that generates first and second reference voltages, a first amplifier unit that amplifies a differential voltage between the first reference voltage and the second reference voltage, a second amplifier unit that amplifies a differential voltage between an internal power supply voltage being supplied to a functional block provided in the semiconductor integrated circuit and the first reference voltage, and a comparator unit that compares an amplification result of the first amplifier unit with an amplification result of the second amplifier unit and outputs a comparison result as a measurement result.
    Type: Application
    Filed: January 28, 2014
    Publication date: July 31, 2014
    Applicant: Renesas Mobile Corporation
    Inventors: TADASHI KAMEYAMA, TAKANOBU NARUSE, YOHEI AKITA, HIROTAKA HARA
  • Publication number: 20090282213
    Abstract: A basic cell capable of a fixed operating frequency regardless of the configuration information, which is also capable of effectively utilizing the arithmetic logic circuit within the cell in a LSI semiconductor integrated circuit, is capable of dynamic changes in configuration information. The circuit has an input switch ISW connected to multiple data input nodes, an output switch OSW connected to multiple data output nodes, a first data path containing an arithmetic logic circuit ALU and a result storage flip-flop CFF0 between the input switch ISW and output switch OSW. The second data path containing a data transfer flip-flop between an input switch ISW and an output switch OSW, and the result storage flip-flop CFF stores the calculated result data from the arithmetic logic circuit ALU, and the data transfer flip-flop holds data input from any of the multiple data input nodes.
    Type: Application
    Filed: July 17, 2009
    Publication date: November 12, 2009
    Inventors: Hiroshi TANAKA, Yohei Akita, Tetsuro Honmura, Fumio Arakawa, Takanobu Tsunoda
  • Patent number: 7568084
    Abstract: A basic cell capable of a fixed operating frequency regardless of the configuration information, which is also capable of effectively utilizing the arithmetic logic circuit within the cell in a LSI semiconductor integrated circuit, is capable of dynamic changes in configuration information. The circuit has an input switch ISW connected to multiple data input nodes, an output switch OSW connected to multiple data output nodes, a first data path containing an arithmetic logic circuit ALU and a result storage flip-flop CFF0 between the input switch ISW and output switch OSW. The second data path containing a data transfer flip-flop between an input switch ISW and an output switch OSW, and the result storage flip-flop CFF stores the calculated result data from the arithmetic logic circuit ALU, and the data transfer flip-flop holds data input from any of the multiple data input nodes.
    Type: Grant
    Filed: July 9, 2004
    Date of Patent: July 28, 2009
    Assignee: Hitachi, Ltd.
    Inventors: Hiroshi Tanaka, Yohei Akita, Tetsuro Honmura, Fumio Arakawa, Takanobu Tsunoda
  • Patent number: 7129741
    Abstract: This invention provides a storage medium on which there is stored a cell library to design a semiconductor integrated circuit to satisfy low power consumption and high speed operation and a design method using the cell library. The cell library is registered with at least two kinds of cells which are different in delay and power consumption while having the same function and the same shape. To satisfy the specification of the semiconductor integrated circuit, one cell is selected from at least two kinds of cells of the cell library.
    Type: Grant
    Filed: April 20, 2004
    Date of Patent: October 31, 2006
    Assignee: Renesas Technology Corp.
    Inventors: Naoki Katoh, Kazuo Yano, Yohei Akita, Mitsuru Hiraki
  • Patent number: 7039576
    Abstract: A system designed, including commercially distributed modules protected as intellectual property (IP), is verified in a manner that the IP provider and the user communicate with each other over a communication line to complete the system design verification. A system verification equipment to be operated by the IP provider receives from the system designer across the communication line an input vector at time n to a module provided to the system designer who designed the system integrated using one or more provided IP modules. After simulating the module operation with the input vector, the verification equipment returns an output vector obtained at time n+1 to the system designer over the communication line. The verification equipment examines the input vectors to the provided IP modules and records statistics information thereof, based on which the provider will quantitatively understand how the provided modules have been used.
    Type: Grant
    Filed: November 14, 2001
    Date of Patent: May 2, 2006
    Assignee: Renesas Technology Corporation
    Inventor: Yohei Akita
  • Patent number: 6970017
    Abstract: There is provided a logic circuit causing the same delay time as a conventional logic circuit and acting as a D flip-flop circuit with a data-selecting function. A logic circuit having the circuitry shown in FIG. 6 will be described briefly. Two transmission gates TG10a (TG10b) and TG11 and two inverters IV10 and IV11 are used to define a data propagation path from an input port I1 (I2) to an output port O1. Thus, four logic gates are located along the path in the same manner as they are in a conventional D flip-flop circuit. The transmission gate TG10a (TG10b) is controlled using a NOR circuit 12a that inputs a clock CLK and a select signal /sel that is the reverse of a select signal sel (NOR circuit 12b that inputs the clock CLK and the select signal sel). The transmission gate TG11 is controlled with the clock CLK. Either of two input data items is selected based on the select signals, and then output.
    Type: Grant
    Filed: September 6, 2001
    Date of Patent: November 29, 2005
    Assignee: Renesas Technology Corp.
    Inventors: Yohei Akita, Naoki Kato, Kazuo Yano
  • Publication number: 20050015572
    Abstract: A basic cell capable of a fixed operating frequency regardless of the configuration information, which is also capable of effectively utilizing the arithmetic logic circuit within the cell in a LSI semiconductor integrated circuit, is capable of dynamic changes in configuration information. The circuit has an input switch ISW connected to multiple data input nodes, an output switch OSW connected to multiple data output nodes, a first data path containing an arithmetic logic circuit ALU and a result storage flip-flop CFF0 between the input switch ISW and output switch OSW. The second data path containing a data transfer flip-flop between an input switch ISW and an output switch OSW, and the result storage flip-flop CFF stores the calculated result data from the arithmetic logic circuit ALU, and the data transfer flip-flop holds data input from any of the multiple data input nodes.
    Type: Application
    Filed: July 9, 2004
    Publication date: January 20, 2005
    Inventors: Hiroshi Tanaka, Yohei Akita, Tetsuro Honmura, Fumio Arakawa, Takanobu Tsunoda
  • Publication number: 20040236929
    Abstract: The present invention provides a program which can maintain program compatibility between different hardware in a small hardware quantity and realize high performance scalability. An operation to be executed and an execution order limitation (dependency) for executing the operation are described into a program given to a logic circuit (hardware) having an ALU and a control circuit. The control circuit in the logic circuit decides an operation execution order based on the dependency described into the read program.
    Type: Application
    Filed: March 3, 2004
    Publication date: November 25, 2004
    Inventor: Yohei Akita
  • Publication number: 20040196684
    Abstract: This invention provides a storage medium on which there is stored a cell library to design a semiconductor integrated circuit to satisfy low power consumption and high speed operation and a design method using the cell library. The cell library is registered with at least two kinds of cells which are different in delay and power consumption while having the same function and the same shape. To satisfy the specification of the semiconductor integrated circuit, one cell is selected from at least two kinds of cells of the cell library.
    Type: Application
    Filed: April 20, 2004
    Publication date: October 7, 2004
    Applicant: Renesas Technology Corp.
    Inventors: Naoki Katoh, Kazuo Yano, Yohei Akita, Mitsuru Hiraki
  • Patent number: 6769110
    Abstract: This invention provides a storage medium on which there is stored a cell library to design a semiconductor integrated circuit to satisfy low power consumption and high speed operation and a design method using the cell library. The cell library is registered with at least two kinds of cells which are different in delay and power consumption while having the same function and the same shape. To satisfy the specification of the semiconductor integrated circuit, one cell is selected from at least two kinds of cells of the cell library.
    Type: Grant
    Filed: February 28, 2002
    Date of Patent: July 27, 2004
    Assignee: Renesas Technology Corp.
    Inventors: Naoki Katoh, Kazuo Yano, Yohei Akita, Mitsuru Hiraki
  • Publication number: 20020079927
    Abstract: Disclosed is a semiconductor integrated circuit device constructed of MOSFETs in which there is attained a harmony between increase in consumption power due to a leakage current and operating speed of the MOSFETs in a suitable manner, and among a plurality of signal paths in the semiconductor integrated circuit device, a path which has a margin in delay is constructed with MOSFETs each with a high threshold voltage, while a path which has no margin in delay is constructed with MOSFETs each with a low threshold voltage which has a large leakage current but a high operating speed, in light of a delay with which a signal is transmitted along a signal path.
    Type: Application
    Filed: February 28, 2002
    Publication date: June 27, 2002
    Applicant: Hitachi Ltd.
    Inventors: Naoki Katoh, Kazuo Yano, Yohei Akita, Mitsuru Hiraki
  • Publication number: 20020059053
    Abstract: A system designed, including commercially distributed modules protected as intellectual property (IP), is verified in a manner that the IP provider and the user communicate with each other over a communication line to complete the system design verification. A system verification equipment to be operated by the IP provider receives from the system designer across the communication line an input vector at time n to a module provided to the system designer who designed the system integrated using one or more provided IP modules. After simulating the module operation with the input vector, the verification equipment returns an output vector obtained at time n+1 to the system designer over the communication line. The verification equipment examines the input vectors to the provided IP modules and records statistics information thereof, based on which the provider will quantitatively understand how the provided modules have been used.
    Type: Application
    Filed: November 14, 2001
    Publication date: May 16, 2002
    Inventor: Yohei Akita
  • Patent number: 6380764
    Abstract: Disclosed is a semiconductor integrated circuit device constructed of MOSFETs in which there is attained a harmony between increase in consumption power due to a leakage current and operating speed of the MOSFETs in a suitable manner, and among a plurality of signal paths in the semiconductor integrated circuit device, a path which has a margin in delay is constructed with MOSFETs each with a high threshold voltage, while a path which has no margin in delay is constructed with MOSFETs each with a low threshold voltage which has a large leakage current but a high operating speed, in light of a delay with which a signal is transmitted along a signal path.
    Type: Grant
    Filed: June 23, 2000
    Date of Patent: April 30, 2002
    Assignee: Hitachi, Ltd.
    Inventors: Naoki Katoh, Kazuo Yano, Yohei Akita, Mitsuru Hiraki
  • Publication number: 20020043990
    Abstract: There is provided a logic circuit causing the same delay time as a conventional logic circuit and acting as a D flip-flop circuit with a data-selecting function.
    Type: Application
    Filed: September 6, 2001
    Publication date: April 18, 2002
    Applicant: Hitachi, Ltd.
    Inventors: Yohei Akita, Naoki Kato, Kazuo Yano
  • Patent number: 6320421
    Abstract: There is provided a logic circuit causing the same delay time as a conventional logic circuit and acting as a D flip-flop circuit with a data-selecting function. A logic circuit having the circuitry shown in FIG. 6 will be described briefly. Two transmission gates TG10a (TG10b) and TG11 and two inverters IV10 and IV11 are used to define a data propagation path from an input port I1 (I2) to an output port O1. Thus, four logic gates are located along the path in the same manner as they are in a conventional D flip-flop circuit. The transmission gate TG10a (TG10b) is controlled using a NOR circuit 12a that inputs a clock CLK and a select signal /sel that is the reverse of a select signal sel (NOR circuit 12b that inputs the clock CLK and the select signal sel). The transmission gate TG11 is controlled with the clock CLK. Either of two input data items is selected based on the select signals, and then output.
    Type: Grant
    Filed: May 30, 2000
    Date of Patent: November 20, 2001
    Assignee: Hitachi, Ltd.
    Inventors: Yohei Akita, Naoki Kato, Kazuo Yano