Patents by Inventor Tooru Kozu

Tooru Kozu 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).

  • Voltage controlled oscillator, frequency synthesizer and communication apparatus
    Patent number: 7221920
    Abstract: A voltage controlled oscillator includes a resonator configured to resonate with an initial oscillation frequency during starting period of oscillation and a steady oscillation frequency during a steady state oscillation. The resonator includes a film bulk acoustic resonator having a series resonance frequency higher than the steady oscillation frequency. A negative resistance circuit configured to drive the resonator, has a positive increment for reactance in the steady state oscillation compared with reactance in the starting period.
    Type: Grant
    Filed: July 15, 2004
    Date of Patent: May 22, 2007
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Kazuhide Abe, Mayumi Morizuka, Ryoichi Ohara, Kenya Sano, Naoko Yanase, Takaaki Yasumoto, Tadahiro Sasaki, Kazuhiko Itaya, Takashi Kawakubo, Hiroshi Yoshida, Ryuichi Fujimoto, Keiichi Yamaguchi, Nobuyuki Itoh, Tooru Kozu, Takeshi Ookubo
  • Voltage controlled oscillator, frequency synthesizer and communication apparatus
    Publication number: 20050059375
    Abstract: A voltage controlled oscillator includes a resonator configured to resonate with an initial oscillation frequency during starting period of oscillation and a steady oscillation frequency during a steady state oscillation. The resonator includes a film bulk acoustic resonator having a series resonance frequency higher than the steady oscillation frequency. A negative resistance circuit configured to drive the resonator, has a positive increment for reactance in the steady state oscillation compared with reactance in the starting period.
    Type: Application
    Filed: July 15, 2004
    Publication date: March 17, 2005
    Applicant: KABUSHIKI KAISHA TOSHIBA
    Inventors: Kazuhide Abe, Mayumi Morizuka, Ryoichi Ohara, Kenya Sano, Naoko Yanase, Takaaki Yasumoto, Tadahiro Sasaki, Kazuhiko Itaya, Takashi Kawakubo, Hiroshi Yoshida, Ryuichi Fujimoto, Keiichi Yamaguchi, Nobuyuki Itoh, Tooru Kozu, Takeshi Ookubo