Patents by Inventor Iwamichi Kojiro

Iwamichi Kojiro 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).

  • Semiconductor device, and method and apparatus for manufacturing semiconductor device
    Patent number: 7262480
    Abstract: A high frequency power amplifying device has two amplifying lines. Each amplifying line has a configuration in which a plurality of amplifying stages are connected in cascade having two source voltage terminals, of which one is connected to the first amplifying stage of one amplifying line and to the remaining amplifying stages of the other amplifying line, and the other, to the first amplifying stage of the latter amplifying line and to the remaining amplifying stages of the former amplifying line. An air core coil with a low D.C. resistance, formed by spirally winding a copper wire of about 0.1 mm in diameter, is connected in series between the final amplifying stage of each amplifying line and the source voltage terminal.
    Type: Grant
    Filed: March 21, 2001
    Date of Patent: August 28, 2007
    Assignees: Hitachi, Ltd., Eastern Japan Semiconductor Technologies, Akita Electronics Co., Ltd.
    Inventors: Toshihiko Kyogoku, Tadashi Kodu, Kiyoharu Mochiduki, Sakae Kikuchi, Akio Ishidu, Yoshihiko Kobayashi, Masashi Maruyama, Iwamichi Kojiro, Susumu Sato
  • Semiconductor device, and method and apparatus for manufacturing semiconductor device
    Publication number: 20040075515
    Abstract: A high frequency power amplifying device has two amplifying lines. Each amplifying line has a configuration in which a plurality of amplifying stages are connected in cascade having two source voltage terminals, of which one is connected to the first amplifying stage of one amplifying line and to the remaining amplifying stages of the other amplifying line, and the other, to the first amplifying stage of the latter amplifying line and to the remaining amplifying stages of the former amplifying line. An air core coil with a low D.C. resistance, formed by spirally winding a copper wire of about 0.1 mm in diameter, is connected in series between the final amplifying stage of each amplifying line and the source voltage terminal. Since there is no signal leak in each amplifying line from the final amplifying stage to the first amplifying stage and the D.C. resistance of the air core coil is low, oscillation margin can be improved.
    Type: Application
    Filed: October 22, 2003
    Publication date: April 22, 2004
    Inventors: Toshihiko Kyogoku, Tadashi Kodu, Kiyoharu Mochiduki, Sakae Kikuchi, Akio Ishidu, Yoshihiko Kobayashi, Masashi Maruyama, Iwamichi Kojiro, Susumu Sato