Patents by Inventor Kiyomitsu Onodera

Kiyomitsu Onodera 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).

  • Vector sum phase shifter, optical transceiver, and control circuit
    Patent number: 8687968
    Abstract: A vector sum phase shifter includes a 90° phase shifter (1) which generates an in-phase signal (VINI) and a quadrature signal (VINQ) from an input signal (VIN), a four-quadrant multiplier (2I) which changes the amplitude of the in-phase signal (VINI) based on a control signal (CI), a four-quadrant multiplier (2Q) which changes the amplitude of the quadrature signal (VINQ) based on a control signal (CQ), a combiner (3) which combines the in-phase signal (VINI) and the quadrature signal (VINQ), and a control circuit (4). The control circuit (4) includes a voltage generator which generates a reference voltage, and a differential amplifier which outputs the difference signal between a control voltage (VC) and the reference voltage as the control signal (CI, CQ). The differential amplifier performs an analog operation of converting the control voltage (VC) into the control signal (CI, CQ) similar to a sine wave or a cosine wave.
    Type: Grant
    Filed: August 12, 2009
    Date of Patent: April 1, 2014
    Assignee: Nippon Telegraph and Telephone Corporation
    Inventors: Hideyuki Nosaka, Munehiko Nagatani, Shogo Yamanaka, Kimikazu Sano, Koichi Murata, Kiyomitsu Onodera, Takatomo Enoki
  • Voltage generator, control circuit, vector sum phase shifter, and optical transceiver
    Patent number: 8687973
    Abstract: A voltage generator (400) includes a resistor ladder including resistors (4000-4008) which divide a supplied voltage to generate a plurality of reference voltages, a resistor (4009) provided between a power supply voltage (VCC) and one terminal of the resistor ladder, and a resistor (4010) provided between a power supply voltage (VEE) and the other terminal of the resistor ladder.
    Type: Grant
    Filed: August 12, 2009
    Date of Patent: April 1, 2014
    Assignee: Nippon Telegraph and Telephone Corporation
    Inventors: Hideyuki Nosaka, Munehiko Nagatani, Shogo Yamanaka, Kimikazu Sano, Koichi Murata, Kiyomitsu Onodera, Takatomo Enoki
  • VOLTAGE GENERATOR, CONTROL CIRCUIT, VECTOR SUM PHASE SHIFTER, AND OPTICAL TRANSCEIVER
    Publication number: 20110236027
    Abstract: A voltage generator (400) includes a resistor ladder including resistors (4000-4008) which divide a supplied voltage to generate a plurality of reference voltages, a resistor (4009) provided between a power supply voltage (VCC) and one terminal of the resistor ladder, and a resistor (4010) provided between a power supply voltage (VEE) and the other terminal of the resistor ladder.
    Type: Application
    Filed: August 12, 2009
    Publication date: September 29, 2011
    Inventors: Hideyuki Nosaka, Munehiko Nagatani, Shogo Yamanaka, Kimikazu Sano, Koichi Murata, Kiyomitsu Onodera, Takatomo Enoki
  • Frequency conversion circuit with linear feedback
    Patent number: 5606738
    Abstract: A frequency conversion circuit having at least one transistor with an input terminal and an output terminal. A frequency signal to be converted or a local oscillator (LO) signal is input to the input terminal, and a converted frequency signal is output from the output terminal. A linear feedback circuit allowing at least a radio frequency (RF) signal and the LO signal to feed back is directly connected across the input and output terminals.
    Type: Grant
    Filed: February 17, 1995
    Date of Patent: February 25, 1997
    Assignee: Nippon Telegraph and Telephone Corp.
    Inventors: Kiyomitsu Onodera, Masahiro Muraguchi