Patents by Inventor Mitsuru Motizuki

Mitsuru Motizuki 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).

  • High-frequency amplifier
    Patent number: 6873208
    Abstract: A high-frequency amplifying unit 2 in which a steep gain variation developed according to a change in the amplitude of input high-frequency signal is suppressed is provided. It amplifies an input high-frequency signal with a plurality of transistors 12-1 to 12-N at the same time a measuring circuit 27 measures amplitude of the input high-frequency signal, and a bias control circuit 26 continuously controls a bias applied to each transistors 12-1 to 12-N according to the value of amplitude measured by the measuring circuit 27. Thus it is possible to suppress a steep gain variation produced according to a variation in the amplitude of input high-frequency signal.
    Type: Grant
    Filed: June 29, 2001
    Date of Patent: March 29, 2005
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventors: Shintaro Shinjo, Kazutomi Mori, Hiroyuki Joba, Hiroaki Nagano, Mitsuru Motizuki, Yukio Ikeda, Noriharu Suematsu
  • High-frequency amplifier
    Patent number: 6650181
    Abstract: A high-frequency amplifying unit 2 in which a steep gain variation developed according to a change in the amplitude of input high-frequency signal is suppressed is provided. It amplifies an input high-frequency signal with a transistor 12 at the same time a measuring circuit 27 measures amplitude of the input high-frequency signal, and a bias control circuit 26 continuously controls a bias applied to the transistor 12 according to the value of amplitude measured by the measuring circuit 27. Thus it is possible to suppress a steep gain variation produced according to a variation in the amplitude of input high-frequency signal.
    Type: Grant
    Filed: June 25, 2002
    Date of Patent: November 18, 2003
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventors: Shintaro Shinjo, Kazutomi Mori, Hiroyuki Joba, Hiroaki Nagano, Mitsuru Motizuki, Yukio Ikeda, Noriharu Suematsu
  • High-frequency amplifier
    Publication number: 20030048135
    Abstract: A high-frequency amplifying unit 2 in which a steep gain variation developed according to a change in the amplitude of input high-frequency signal is suppressed is provided. It amplifies an input high-frequency signal with a plurality of transistors 12-1 to 12-N at the same time a measuring circuit 27 measures amplitude of the input high-frequency signal, and a bias control circuit 26 continuously controls a bias applied to each transistors 12-1 to 12-N according to the value of amplitude measured by the measuring circuit 27. Thus it is possible to suppress a steep gain variation produced according to a variation in the amplitude of input high-frequency signal.
    Type: Application
    Filed: July 2, 2002
    Publication date: March 13, 2003
    Inventors: Shintaro Shinjo, Kazutomi Mori, Hiroyuki Joba, Hiroaki Nagano, Mitsuru Motizuki, Yukio Ikeda, Norihasu Suematsu
  • High-frequency amplifier
    Publication number: 20020171483
    Abstract: A high-frequency amplifying unit 2 in which a steep gain variation developed according to a change in the amplitude of input high-frequency signal is suppressed is provided. It amplifies an input high-frequency signal with a transistor 12 at the same time a measuring circuit 27 measures amplitude of the input high-frequency signal, and a bias control circuit 26 continuously controls a bias applied to the transistor 12 according to the value of amplitude measured by the measuring circuit 27. Thus it is possible to suppress a steep gain variation produced according to a variation in the amplitude of input high-frequency signal.
    Type: Application
    Filed: June 25, 2002
    Publication date: November 21, 2002
    Inventors: Shintaro Shinjo, Kazutomi Mori, Hiroyuki Joba, Hiroaki Nagano, Mitsuru Motizuki, Yukio Ikeda, Noriharu Suematsu