Patents by Inventor Shintarou Shinjo

Shintarou Shinjo 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).

  • Multistage amplifier
    Patent number: 6812794
    Abstract: An inter-stage matching circuit 26 comprises a one-stage high pass filter type matching unit 28 and a one-stage low pass filter type matching unit 29 serially connected with each other.
    Type: Grant
    Filed: September 10, 2001
    Date of Patent: November 2, 2004
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventors: Kazutomi Mori, Shintarou Shinjo, Fumimasa Kitabayashi, Yukio Ikeda
  • Multistage amplifier
    Patent number: 6750724
    Abstract: A bias condition of at least one amplifier among amplifiers other than a last-stage amplifier is set in consideration of the relation between an idle current and a saturation current.
    Type: Grant
    Filed: April 17, 2002
    Date of Patent: June 15, 2004
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventors: Kazutomi Mori, Shintarou Shinjo, Yukio Ikeda
  • High-frequency amplifier
    Patent number: 6750720
    Abstract: Between resistors 13, 14 and an NPN bipolar transistor 12 are interposed PNP bipolar transistors 21, 22 forming a current mirror 20 that uses a collector current of the NPN bipolar transistor 12 as a reference current, and determines a collector current of an NPN bipolar transistor 11. This makes possible to design a size ratio A of the PNP bipolar transistors 21, 22 so as to approximate a voltage drop &Dgr;Vb to a value close to zero, and to suppress the voltage drop &Dgr;Vb of the base voltage Vb accordingly to achieve a high power output and high efficiency when a high frequency input signal Pin increases and generates a base rectified current.
    Type: Grant
    Filed: June 12, 2002
    Date of Patent: June 15, 2004
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventors: Kazutomi Mori, Shintarou Shinjo, Hiroyuki Joba, Yoshinori Takahashi, Yukio Ikeda, Tadashi Takagi