Patents by Inventor Kazuhiro Iyomasa

Kazuhiro Iyomasa 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: 10396721
    Abstract: A distributor distributes an input signal to a first transmission line and a second transmission line. A high-pass filter, a first linearizer, and a first phase shifter disposed on the first transmission line adjust the phase and amplitude of an intermodulation distortion in a low-frequency range. A low-pass filter, a second linearizer, and a second phase shifter disposed on the second transmission line adjust the phase and amplitude of an intermodulation distortion in a high-frequency range. A synthesizer synthesizes the signal from the first transmission line and the signal from the second transmission line.
    Type: Grant
    Filed: November 18, 2015
    Date of Patent: August 27, 2019
    Assignee: MITSUBISHI ELECTRIC CORPORATION
    Inventors: Yuji Komatsuzaki, Yuichi Fujimoto, Jun Nishihara, Kazuhiro Iyomasa, Koji Yamanaka
  • Patent number: 10355130
    Abstract: A semiconductor device is provided with one or more gate fingers (20) that are provided in an active region on a semiconductor substrate (1), and a source finger (30) and a drain finger (40) that are provided in the active region and arranged alternately to allow each gate finger to be sandwiched between the source and drain fingers. The semiconductor device includes terminal circuit (60) that has inductive impedance at the frequency of a signal input to an input terminal of the one or more gate fingers, and is directly or indirectly connected to the one or more gate fingers at an area being spaced away from a connecting position of the input terminal (21a) of the one or more gate fingers (20).
    Type: Grant
    Filed: June 23, 2015
    Date of Patent: July 16, 2019
    Assignee: Mitsubishi Electric Corporation
    Inventors: Shohei Imai, Kazuhiro Iyomasa, Koji Yamanaka, Hiroaki Maehara, Ko Kanaya, Tetsuo Kunii, Hideaki Katayama
  • Publication number: 20180316317
    Abstract: A distributor distributes an input signal to a first transmission line and a second transmission line. A high-pass filter, a first linearizer, and a first phase shifter disposed on the first transmission line adjust the phase and amplitude of an intermodulation distortion in a low-frequency range. A low-pass filter, a second linearizer, and a second phase shifter disposed on the second transmission line adjust the phase and amplitude of an intermodulation distortion in a high-frequency range. A synthesizer synthesizes the signal from the first transmission line and the signal from the second transmission line.
    Type: Application
    Filed: November 18, 2015
    Publication date: November 1, 2018
    Applicant: Mitsubishi Electric Corporation
    Inventors: Yuji KOMATSUZAKI, Yuichi FUJIMOTO, Jun NISHIHARA, Kazuhiro IYOMASA, Koji YAMANAKA
  • Publication number: 20180006152
    Abstract: A semiconductor device is provided with one or more gate fingers (20) that are provided in an active region on a semiconductor substrate (1), and a source finger (30) and a drain finger (40) that are provided in the active region and arranged alternately to allow each gate finger to be sandwiched between the source and drain fingers. The semiconductor device includes terminal circuit (60) that has inductive impedance at the frequency of a signal input to an input terminal of the one or more gate fingers, and is directly or indirectly connected to the one or more gate fingers at an area being spaced away from a connecting position of the input terminal (21a) of the one or more gate fingers (20).
    Type: Application
    Filed: June 23, 2015
    Publication date: January 4, 2018
    Applicant: Mitsubishi Electric Corporation
    Inventors: Shohei IMAI, Kazuhiro IYOMASA, Koji YAMANAKA, Hiroaki MAEHARA, Ko KANAYA, Tetsuo KUNII, Hideaki KATAYAMA
  • Patent number: 9331373
    Abstract: Disclosed is a directional coupler including a first hollow portion that is disposed in a first ground conductor and is arranged directly above a first signal conductor and a second signal conductor, and that is constructed of a discontinuous structure that has a function of delaying the phase and that is small with respect to the one-quarter wavelength of an operating frequency.
    Type: Grant
    Filed: March 25, 2014
    Date of Patent: May 3, 2016
    Assignee: MITSUBISHI ELECTRIC CORPORATION
    Inventors: Akimichi Hirota, Tetsu Owada, Kazuhiro Iyomasa, Shinsuke Watanabe, Kazuya Yamamoto
  • Patent number: 9270236
    Abstract: A power amplifier is smaller in size and limits input noise having a differential frequency. A power amplifier has an input terminal, an amplifying transistor, a bias circuit, a filter circuit, and an impedance matching circuit. The bias circuit supplies a bias to the signal input side of the amplifying transistor. The filter circuit removes noise at the signal input side of the amplifying transistor. The filter circuit has a matching resistor, a chip inductor, and a chip capacitor. Each of the chip inductor and the chip capacitor is a surface mount device. The matching resistor is located on a semiconductor substrate, has a first end connected to a connection point of two MIM capacitors, and a second end connected to a connection point of one of the MIM capacitors and the signal input side of the amplifying transistor.
    Type: Grant
    Filed: May 5, 2014
    Date of Patent: February 23, 2016
    Assignee: MITSUBISHI ELECTRIC CORPORATION
    Inventors: Shintaro Watanabe, Kazuhiro Iyomasa
  • Patent number: 9184485
    Abstract: Disclosed is a directional coupler including a broadside coupled line 1031 provided with a main signal line conductor 1001 and a secondary signal line conductor 1011 arranged in parallel with the main signal line conductor 1001, and an offset broadside coupled line 1032 provided with a main signal line conductor 1002 having an end portion connected to an end portion of the main signal line conductor 1001 and a second secondary signal line conductor 1012 having an end portion connected to an end portion of the secondary signal line conductor 1011, and arranged in parallel with the main signal line conductor 1002, in which a coupled line impedance in the broadside coupled line 1031 is lower than a terminal impedance and a coupled line impedance in the offset broadside coupled line 1032 is higher than the terminal impedance.
    Type: Grant
    Filed: March 25, 2014
    Date of Patent: November 10, 2015
    Assignee: Mitsubishi Electric Corporation
    Inventors: Hideharu Yoshioka, Akimichi Hirota, Tetsu Owada, Shinsuke Watanabe, Kazuhiro Iyomasa, Kazuya Yamamoto
  • Publication number: 20150070096
    Abstract: A power amplifier is smaller in size and limits input noise having a differential frequency. A power amplifier has an input terminal, an amplifying transistor, a bias circuit, a filter circuit, and an impedance matching circuit. The bias circuit supplies a bias to the signal input side of the amplifying transistor. The filter circuit removes noise at the signal input side of the amplifying transistor. The filter circuit has a matching resistor, a chip inductor, and a chip capacitor. Each of the chip inductor and the chip capacitor is a surface mount device. The matching resistor is located on a semiconductor substrate, has a first end connected to a connection point of two MIM capacitors, and a second end connected to a connection point of one of the MIM capacitors and the signal input side of the amplifying transistor.
    Type: Application
    Filed: May 5, 2014
    Publication date: March 12, 2015
    Applicant: Mitsubishi Electric Corporation
    Inventors: Shintaro Watanabe, Kazuhiro Iyomasa
  • Patent number: 8917144
    Abstract: A power amplifier includes: an amplification element amplifying an input signal; and a bias circuit supplying a bias current to an input of the amplification element. The bias circuit includes a reference voltage terminal to which a battery voltage is applied from a battery, a first resistor having a first end connected to the reference voltage terminal, a second resistor connected between a second end of the first resistor and ground, and a first transistor. The first transistor has a control terminal connected to a connection point between the first resistor and the second resistor, a first terminal connected to a power supply, and a second terminal connected to the input of the amplification element. The first and second resistors are the same material.
    Type: Grant
    Filed: March 15, 2013
    Date of Patent: December 23, 2014
    Assignee: Mitsubishi Electric Corporation
    Inventors: Kazuhiro Iyomasa, Takayuki Matsuzuka
  • Publication number: 20140292439
    Abstract: Disclosed is a directional coupler including a broadside coupled line 1031 provided with a main signal line conductor 1001 and a secondary signal line conductor 1011 arranged in parallel with the main signal line conductor 1001, and an offset broadside coupled line 1032 provided with a main signal line conductor 1002 having an end portion connected to an end portion of the main signal line conductor 1001 and a second secondary signal line conductor 1012 having an end portion connected to an end portion of the secondary signal line conductor 1011, and arranged in parallel with the main signal line conductor 1002, in which a coupled line impedance in the broadside coupled line 1031 is lower than a terminal impedance and a coupled line impedance in the offset broadside coupled line 1032 is higher than the terminal impedance.
    Type: Application
    Filed: March 25, 2014
    Publication date: October 2, 2014
    Applicant: MITSUBISHI ELECTRIC CORPORATION
    Inventors: Hideharu YOSHIOKA, Akimichi HIROTA, Tetsu OWADA, Shinsuke WATANABE, Kazuhiro IYOMASA, Kazuya YAMAMOTO
  • Publication number: 20140292440
    Abstract: Disclosed is a directional coupler including a first hollow portion 1301 that is disposed in a first ground conductor 1201 and is arranged directly above a first signal conductor 1001 and a second signal conductor 1002, and that is constructed of a discontinuous structure that has a function of delaying the phase and that is small with respect to the one-quarter wavelength of an operating frequency.
    Type: Application
    Filed: March 25, 2014
    Publication date: October 2, 2014
    Applicant: MITSUBISHI ELECTRIC CORPORATION
    Inventors: Akimichi HIROTA, Tetsu OWADA, Kazuhiro IYOMASA, Shinsuke WATANABE, Kazuya YAMAMOTO
  • Publication number: 20140070890
    Abstract: A power amplifier includes: an amplification element amplifying an input signal; and a bias circuit supplying a bias current to an input of the amplification element. The bias circuit includes a reference voltage terminal to which a battery voltage is applied from a battery, a first resistor having a first end connected to the reference voltage terminal, a second resistor connected between a second end of the first resistor and ground, and a first transistor. The first transistor has a control terminal connected to a connection point between the first resistor and the second resistor, a first terminal connected to a power supply, and a second terminal connected to the input of the amplification element. The first and second resistors are the same material.
    Type: Application
    Filed: March 15, 2013
    Publication date: March 13, 2014
    Applicant: Mitsubishi Electric Corporation
    Inventors: Kazuhiro Iyomasa, Takayuki Matsuzuka
  • Patent number: 8659352
    Abstract: A power amplifier includes: a first amplifying element amplifying an input signal; a second amplifying element amplifying an output signal of the first amplifying element; a third amplifying element amplifying the input signal; a first switch connected between an output of the first amplifying element and an input of second amplifying element; a second switch connected between an output of the first amplifying element and an output of the third amplifying element; a third switch connected between an output of the first amplifying element and an output of the second amplifying element; a reference voltage generating a circuit generating reference voltage; a bias circuit supplying a bias current, based on the reference voltage, to inputs of the first, second, and third amplifying elements; and a control circuit controlling the first, second and third switches and the reference voltage generating circuit.
    Type: Grant
    Filed: August 31, 2012
    Date of Patent: February 25, 2014
    Assignee: Mitsubishi Electric Corporation
    Inventors: Takayuki Matsuzuka, Kazuhiro Iyomasa
  • Publication number: 20130249626
    Abstract: A multiple power mode amplifier includes: N amplifiers connected in series via switches; and a control circuit for controlling the N amplifiers in accordance with the output modes. P amplifiers out of the N amplifiers constitute a driver amplifier, and constitute a negative feedback amplifier including a feedback circuit for negatively feeding back its own output signal to its own input side. N?P amplifiers constitute a final stage amplifier connected in series to the negative feedback amplifier in a disconnectable manner. The control circuit is configured to: in a first output mode, disconnect the final stage amplifier from the negative feedback amplifier, and disable the feedback circuit; and in a second output mode, connect the final stage amplifier in series to the negative feedback amplifier, and enable the feedback circuit.
    Type: Application
    Filed: November 9, 2011
    Publication date: September 26, 2013
    Applicant: Mitsubishi Electric Corporation
    Inventors: Naoko Matsunaga, Kenichi Horiguchi, Hiroshi Otsuka, Masatoshi Nakayama, Kazuhiro Iyomasa, Kazuya Yamamoto, Akira Inoue
  • Publication number: 20130241659
    Abstract: A power amplifier includes: a first amplifying element amplifying an input signal; a second amplifying element amplifying an output signal of the first amplifying element; a third amplifying element amplifying the input signal; a first switch connected between an output of the first amplifying element and an input of second amplifying element; a second switch connected between an output of the first amplifying element and an output of the third amplifying element; a third switch connected between an output of the first amplifying element and an output of the second amplifying element; a reference voltage generating a circuit generating reference voltage; a bias circuit supplying a bias current, based on the reference voltage, to inputs of the first, second, and third amplifying elements; and a control circuit controlling the first, second and third switches and the reference voltage generating circuit.
    Type: Application
    Filed: August 31, 2012
    Publication date: September 19, 2013
    Applicant: MITSUBISHI ELECTRIC CORPORATION
    Inventors: Takayuki Matsuzuka, Kazuhiro Iyomasa
  • Patent number: 8519795
    Abstract: A high frequency power amplifier includes: a first transistor for amplifying an input high-frequency signal; a second transistor for amplifying an output signal of the first transistor; a third transistor connected in parallel with the first transistor and for amplifying the input high-frequency signal; a first switching element connected between an output of the first transistor and an input of the second transistor; a second switching element connected between an output of the third transistor and the first switching element; third and fourth switching elements connected in series between the output of the first transistor and an output of the second transistor, and between the second switching element and the output of the second transistor; and a first capacitor connected between the third switching element and the fourth switching element.
    Type: Grant
    Filed: March 23, 2012
    Date of Patent: August 27, 2013
    Assignee: Mitsubishi Electric Corporation
    Inventors: Shintaro Watanabe, Kazuhiro Iyomasa, Hiroaki Maehara, Jun Takaso
  • Publication number: 20130113561
    Abstract: An output mode switching amplifier, including: a transistor for signal amplification connected between a first node on an input side and a second node on an output side; a bypass path for bypassing the transistor between the first node and the second node; a voltage control circuit for switching whether to apply a bias voltage to the transistor so that a transmission signal is amplified by the transistor or to output a transmission signal via the bypass path without amplifying the transmission signal by the transistor; and a second-harmonic reflection circuit connected to the bypass path, for reflecting a second harmonic of the transmission signal.
    Type: Application
    Filed: October 21, 2010
    Publication date: May 9, 2013
    Applicant: MITSUBISHI ELECTRIC CORPORATION
    Inventors: Kenichi Horiguchi, Naoko Matsunaga, Hiroshi Otsuka, Masatoshi Nakayama, Kazuhiro Iyomasa, Akira Inoue
  • Publication number: 20120293257
    Abstract: A high frequency power amplifier includes: a first transistor for amplifying an input high-frequency signal; a second transistor for amplifying an output signal of the first transistor; a third transistor connected in parallel with the first transistor and for amplifying the input high-frequency signal; a first switching element connected between an output of the first transistor and an input of the second transistor; a second switching element connected between an output of the third transistor and the first switching element; third and fourth switching elements connected in series between the output of the first transistor and an output of the second transistor, and between the second switching element and the output of the second transistor; and a first capacitor connected between the third switching element and the fourth switching element.
    Type: Application
    Filed: March 23, 2012
    Publication date: November 22, 2012
    Applicant: MITSUBISHI ELECTRIC CORPORATION
    Inventors: Shintaro WATANABE, Kazuhiro IYOMASA, Hiroaki MAEHARA, Jun TAKASO
  • Patent number: 7907009
    Abstract: Provided is a high frequency amplifier including two amplifying elements of different element sizes connected in parallel and switching the amplifying elements in accordance with a level of output power. In particular, the high frequency amplifier includes an output matching circuit for matching to characteristic impedance (50 ohms) both when the output power is high and low, and increasing impedance when the turned-off amplifying element is viewed from a connection node on an output side of the two amplifying elements. Consequently, characteristics such as high output power and high efficiency can be achieved and it is possible to prevent an amplified high frequency signal from passing around to a matching circuit on a turned-off amplifying element side.
    Type: Grant
    Filed: November 30, 2006
    Date of Patent: March 15, 2011
    Assignee: Mitsubishi Electric Corporation
    Inventors: Kazutomi Mori, Kazuhiro Iyomasa, Akira Ohta, Teruyuki Shimura, Masatoshi Nakayama
  • Publication number: 20100033241
    Abstract: Provided is a high frequency amplifier including two amplifying elements of different element sizes connected in parallel and switching the amplifying elements in accordance with a level of output power. In particular, the high frequency amplifier includes an output matching circuit for matching to characteristic impedance (50 ohms) both when the output power is high and low, and increasing impedance when the turned-off amplifying element is viewed from a connection node on an output side of the two amplifying elements. Consequently, characteristics such as high output power and high efficiency can be achieved and it is possible to prevent an amplified high frequency signal from passing around to a matching circuit on a turned-off amplifying element side.
    Type: Application
    Filed: November 30, 2006
    Publication date: February 11, 2010
    Applicant: Mitsubishi Electric Corporation
    Inventors: Kazutomi Mori, Kazuhiro Iyomasa, Akira Ohta, Teruyuki Shimura, Masatoshi Nakayama