Patents by Inventor Yuta Araki

Yuta Araki 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: 7663420
    Abstract: A MOS resistance controlling device includes: a plurality of MOS transistors having a first MOS transistor to N-th (the integer N is larger than 1) MOS transistor being serially connected, the source of the first MOS transistor being set to a first reference potential, the drain the N-th MOS transistor being set to a second reference potential, and the drain of an I-th MOS transistor being connected to the source of an I+1-th MOS transistor, where I is an integer from 1 to N?1; a current source which is electrically disposed at connection node between the drain of the N-th MOS transistors and the second reference potential; and an operational amplifier having a first input terminal being supplied with a third reference potential, a second input terminal connected with the connection node and an output terminal being connected with gates of the MOS transistors.
    Type: Grant
    Filed: November 7, 2007
    Date of Patent: February 16, 2010
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Yuta Araki, Shoji Otaka, Toru Hashimoto
  • Publication number: 20090251202
    Abstract: A control target circuit formed by transistors is provided with a power supply level control circuit for controlling the power supply voltage supplied to the control target circuit, a substrate level control circuit for controlling the substrate voltages of the transistors, and a special substrate level control circuit for controlling the substrate voltages during transition of the power supply voltage through a different system. During transition of the power supply voltage, the special substrate level control circuit positively controls the substrate voltages such that desired substrate voltage levels are reached earlier, whereby the time for the substrate voltages to transfer to the desired substrate voltage levels is shortened. To suppress latch-up and breakdown voltage degradation, the special substrate level control circuit controls supply of voltages and currents so as to comply with the potential difference conditions defined between the power supply voltage and the substrate voltages.
    Type: Application
    Filed: April 4, 2008
    Publication date: October 8, 2009
    Inventor: Yuta ARAKI
  • Patent number: 7501892
    Abstract: An amplifier circuit according to the present invention comprises: a first differential amplifier circuit including a first transistor having a gate terminal forming a first input node, a second transistor having a gate terminal forming a second input node and having a dimensional ratio with respect to the first transistor of K:M (where K>M), and a first current source that supplies a first current to a source terminal of the first transistor and a source terminal of the second transistor; a second differential amplifier circuit including a third transistor having a gate terminal forming a third input node, a fourth transistor having a gate terminal forming a fourth input node and having a dimensional ratio with respect to the third transistor of M:K, and a second current source that supplies a second current to a source terminal of the third transistor and a source terminal of the fourth transistor, the second differential amplifier circuit having a same gain as the first differential amplifier circuit; a
    Type: Grant
    Filed: May 31, 2007
    Date of Patent: March 10, 2009
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Shoji Otaka, Yuta Araki
  • Publication number: 20090042521
    Abstract: A radio transmitter including a combiner which combines input I/Q signals with feedback I/Q signals, a power amplifier which amplifies the quadrature modulated signal, a detector which detects amplitude and phase differences between the input and feedback I/Q signals, a switch to turn on and off the feedback I/Q signals, a generator to generate control signals which minimizes the amplitude difference and the phase difference, in a state where a transmission power is set, during for a period during which the switch is turned off, an amplitude adjuster which adjusts an amplitude of the feedback RF signal, during a period during which the switch is turned on, and a phase adjuster which adjusts a phase of the local signal, during the period during which the switch is turned on.
    Type: Application
    Filed: August 7, 2008
    Publication date: February 12, 2009
    Inventors: Shoji Otaka, Yuta Araki, Toru Hashimoto
  • Publication number: 20080311867
    Abstract: A MOS resistance controlling device includes: a plurality of MOS transistors having a first MOS transistor to N-th (the integer N is larger than 1) MOS transistor being serially connected, the source of the first MOS transistor being set to a first reference potential, the drain the N-th MOS transistor being set to a second reference potential, and the drain of an I-th MOS transistor being connected to the source of an I+1-th MOS transistor, where I is an integer from 1 to N?1; a current source which is electrically disposed at connection node between the drain of the N-th MOS transistors and the second reference potential; and an operational amplifier having a first input terminal being supplied with a third reference potential, a second input terminal connected with the connection node and an output terminal being connected with gates of the MOS transistors.
    Type: Application
    Filed: February 4, 2008
    Publication date: December 18, 2008
    Applicant: KABUSHIKI KAISHA TOSHIBA
    Inventors: Yuta Araki, Shoji Otaka, Toru Hashimoto
  • Publication number: 20080204107
    Abstract: A MOS resistance controlling device includes: a plurality of MOS transistors having a first MOS transistor to N-th (the integer N is larger than 1) MOS transistor being serially connected, the source of the first MOS transistor being set to a first reference potential, the drain the N-th MOS transistor being set to a second reference potential, and the drain of an I-th MOS transistor being connected to the source of an I+1-th MOS transistor, where I is an integer from 1 to N?1; a current source which is electrically disposed at connection node between the drain of the N-th MOS transistors and the second reference potential; and an operational amplifier having a first input terminal being supplied with a third reference potential, a second input terminal connected with the connection node and an output terminal being connected with gates of the MOS transistors.
    Type: Application
    Filed: November 7, 2007
    Publication date: August 28, 2008
    Applicant: KABUSHIKI KAISHA TOSHIBA
    Inventors: Yuta Araki, Shoji Otaka, Toru Hashimoto
  • Patent number: 7388411
    Abstract: A semiconductor integrated circuit device according to the present invention includes: a sample circuit in which through current to be monitored flows during switching between transistors; a non-overlap circuit for outputting an output signal for the switching in the sample circuit; a current detector for detecting the through current flowing during the switching; and a current comparator in which a reference current value with respect to the through current has been set and which compares a current value detected by the current detector with the reference current value and outputs a result of the comparison to the non-overlap circuit.
    Type: Grant
    Filed: May 9, 2007
    Date of Patent: June 17, 2008
    Assignee: Matsushiita Electric Industrial Co., Ltd.
    Inventors: Yuta Araki, Isao Tanaka, Masaya Sumita
  • Publication number: 20080068082
    Abstract: An amplifier circuit according to the present invention comprises: a first differential amplifier circuit including a first transistor having a gate terminal forming a first input node, a second transistor having a gate terminal forming a second input node and having a dimensional ratio with respect to the first transistor of K:M (where K>M), and a first current source that supplies a first current to a source terminal of the first transistor and a source terminal of the second transistor; a second differential amplifier circuit including a third transistor having a gate terminal forming a third input node, a fourth transistor having a gate terminal forming a fourth input node and having a dimensional ratio with respect to the third transistor of M:K, and a second current source that supplies a second current to a source terminal of the third transistor and a source terminal of the fourth transistor, the second differential amplifier circuit having a same gain as the first differential amplifier circuit; a
    Type: Application
    Filed: May 31, 2007
    Publication date: March 20, 2008
    Applicant: KABUSHIKI KAISHA TOSHIBA
    Inventors: Shoji Otaka, Yuta Araki
  • Publication number: 20070216450
    Abstract: A semiconductor integrated circuit device according to the present invention includes: a sample circuit in which through current to be monitored flows during switching between transistors; a non-overlap circuit for outputting an output signal for the switching in the sample circuit; a current detector for detecting the through current flowing during the switching; and a current comparator in which a reference current value with respect to the through current has been set and which compares a current value detected by the current detector with the reference current value and outputs a result of the comparison to the non-overlap circuit.
    Type: Application
    Filed: May 9, 2007
    Publication date: September 20, 2007
    Applicant: Matsushita Electric Industrial Co., Ltd.
    Inventors: Yuta Araki, Isao Tanaka, Masaya Sumita
  • Patent number: 7248846
    Abstract: An amplifier comprises a first amplifier circuit which amplifies a first signal to output an amplified first signal, a circuit which outputs a second signal corresponding to a difference between the first signal and the amplified first signal, a second amplifier circuit which amplifies the second signal to output an amplified second signal, a combine circuit which outputs an amplified signal by combining the amplified second signal with the amplified first signal, and a controller which controls a supply of a power to the first amplifier circuit and the second amplifier circuit and has a first mode to supply the power to the second amplifier circuit without supplying the power to the first amplifier circuit.
    Type: Grant
    Filed: January 29, 2004
    Date of Patent: July 24, 2007
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Hiroyuki Kayano, Yuta Araki, Yuuji Ohtsuka
  • Patent number: 7227391
    Abstract: A semiconductor integrated circuit device according to the present invention includes: a sample circuit in which through current to be monitored flows during switching between transistors; a non-overlap circuit for outputting an output signal for the switching in the sample circuit; a current detector for detecting the through current flowing during the switching; and a current comparator in which a reference current value with respect to the through current has been set and which compares a current value detected by the current detector with the reference current value and outputs a result of the comparison to the non-overlap circuit.
    Type: Grant
    Filed: April 28, 2005
    Date of Patent: June 5, 2007
    Assignee: Matsushita Electric Industrial Co., Ltd.
    Inventors: Yuta Araki, Isao Tanaka, Masaya Sumita
  • Patent number: 7138862
    Abstract: A power amplifier includes amplifier elements to amplify input signals of different frequencies. The amplifier also includes a power supply circuit that includes a common power supply path including an end connected to a power supply input terminal connected to a DC power supply. The amplifier further includes individual power supply paths each including an end connected to the other end of the common power supply path, and the other end connected to the main electrode of a corresponding one of the amplifier elements. The individual power supply paths have different impedances.
    Type: Grant
    Filed: October 26, 2005
    Date of Patent: November 21, 2006
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Yuta Araki, Hiroyuki Kayano, Keiichi Yamaguchi
  • Patent number: 7095276
    Abstract: A power amplifier includes amplifier elements to amplify input signals of different frequencies. The amplifier also includes a power supply circuit that includes a common power supply path including an end connected to a power supply input terminal connected to a DC power supply. The amplifier further includes individual power supply paths each including an end connected to the other end of the common power supply path, and the other end connected to the main electrode of a corresponding one of the amplifier elements. The individual power supply paths have different impedances.
    Type: Grant
    Filed: October 26, 2005
    Date of Patent: August 22, 2006
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Yuta Araki, Hiroyuki Kayano, Keiichi Yamaguchi
  • Patent number: 7091776
    Abstract: A power amplifier includes amplifier elements to amplify input signals of different frequencies. The amplifier also includes a power supply circuit that includes a common power supply path including an end connected to a power supply input terminal connected to a DC power supply. The amplifier further includes individual power supply paths each including an end connected to the other end of the common power supply path, and the other end connected to the main electrode of a corresponding one of the amplifier elements. The individual power supply paths have different impedances.
    Type: Grant
    Filed: October 26, 2005
    Date of Patent: August 15, 2006
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Yuta Araki, Hiroyuki Kayano, Keiichi Yamaguchi
  • Patent number: 7046084
    Abstract: A power amplifier includes amplifier elements to amplify input signals of different frequencies. The amplifier also includes a power supply circuit that includes a common power supply path including an end connected to a power supply input terminal connected to a DC power supply. The amplifier further includes individual power supply paths each including an end connected to the other end of the common power supply path, and the other end connected to the main electrode of a corresponding one of the amplifier elements. The individual power supply paths have different impedances.
    Type: Grant
    Filed: October 26, 2005
    Date of Patent: May 16, 2006
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Yuta Araki, Hiroyuki Kayano, Keiichi Yamaguchi
  • Patent number: 7046085
    Abstract: A power amplifier includes amplifier elements to amplify input signals of different frequencies. The amplifier also includes a power supply circuit that includes a common power supply path including an end connected to a power supply input terminal connected to a DC power supply. The amplifier further includes individual power supply paths each including an end connected to the other end of the common power supply path, and the other end connected to the main electrode of a corresponding one of the amplifier elements. The individual power supply paths have different impedances.
    Type: Grant
    Filed: October 26, 2005
    Date of Patent: May 16, 2006
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Yuta Araki, Hiroyuki Kayano, Keiichi Yamaguchi
  • Publication number: 20060038613
    Abstract: A power amplifier includes amplifier elements to amplify input signals of different frequencies. The amplifier also includes a power supply circuit that includes a common power supply path including an end connected to a power supply input terminal connected to a DC power supply. The amplifier further includes individual power supply paths each including an end connected to the other end of the common power supply path, and the other end connected to the main electrode of a corresponding one of the amplifier elements. The individual power supply paths have different impedances.
    Type: Application
    Filed: October 26, 2005
    Publication date: February 23, 2006
    Inventors: Yuta Araki, Hiroyuki Kayano, Keiichi Yamaguchi
  • Publication number: 20060038612
    Abstract: A power amplifier includes amplifier elements to amplify input signals of different frequencies. The amplifier also includes a power supply circuit that includes a common power supply path including an end connected to a power supply input terminal connected to a DC power supply. The amplifier further includes individual power supply paths each including an end connected to the other end of the common power supply path, and the other end connected to the main electrode of a corresponding one of the amplifier elements. The individual power supply paths have different impedances.
    Type: Application
    Filed: October 26, 2005
    Publication date: February 23, 2006
    Inventors: Yuta Araki, Hiroyuki Kayano, Keiichi Yamaguchi
  • Publication number: 20060033565
    Abstract: A power amplifier includes amplifier elements to amplify input signals of different frequencies. The amplifier also includes a power supply circuit that includes a common power supply path including an end connected to a power supply input terminal connected to a DC power supply. The amplifier further includes individual power supply paths each including an end connected to the other end of the common power supply path, and the other end connected to the main electrode of a corresponding one of the amplifier elements. The individual power supply paths have different impedances.
    Type: Application
    Filed: October 26, 2005
    Publication date: February 16, 2006
    Inventors: Yuta Araki, Hiroyuki Kayano, Keiichi Yamaguchi
  • Publication number: 20060033566
    Abstract: A power amplifier includes amplifier elements to amplify input signals of different frequencies. The amplifier also includes a power supply circuit that includes a common power supply path including an end connected to a power supply input terminal connected to a DC power supply. The amplifier further includes individual power supply paths each including an end connected to the other end of the common power supply path, and the other end connected to the main electrode of a corresponding one of the amplifier elements. The individual power supply paths have different impedances.
    Type: Application
    Filed: October 26, 2005
    Publication date: February 16, 2006
    Inventors: Yuta Araki, Hiroyuki Kayano, Keiichi Yamaguchi