Patents by Inventor Hiroyuki Joba

Hiroyuki Joba 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
    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