The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 22, 2007
Filed:
Jul. 15, 2004
Kazuhide Abe, Kawasaki, JP;
Mayumi Morizuka, Kawasaki, JP;
Ryoichi Ohara, Yokohama, JP;
Kenya Sano, Kawasaki, JP;
Naoko Yanase, Kawasaki, JP;
Takaaki Yasumoto, Kawasaki, JP;
Tadahiro Sasaki, Nerima-ku, JP;
Kazuhiko Itaya, Yokohama, JP;
Takashi Kawakubo, Yokohama, JP;
Hiroshi Yoshida, Yokohama, JP;
Ryuichi Fujimoto, Ota-ku, JP;
Keiichi Yamaguchi, Kawasaki, JP;
Nobuyuki Itoh, Bunkyo-ku, JP;
Tooru Kozu, Kawasaki, JP;
Takeshi Ookubo, Fukaya, JP;
Kazuhide Abe, Kawasaki, JP;
Mayumi Morizuka, Kawasaki, JP;
Ryoichi Ohara, Yokohama, JP;
Kenya Sano, Kawasaki, JP;
Naoko Yanase, Kawasaki, JP;
Takaaki Yasumoto, Kawasaki, JP;
Tadahiro Sasaki, Nerima-ku, JP;
Kazuhiko Itaya, Yokohama, JP;
Takashi Kawakubo, Yokohama, JP;
Hiroshi Yoshida, Yokohama, JP;
Ryuichi Fujimoto, Ota-ku, JP;
Keiichi Yamaguchi, Kawasaki, JP;
Nobuyuki Itoh, Bunkyo-ku, JP;
Tooru Kozu, Kawasaki, JP;
Takeshi Ookubo, Fukaya, JP;
Kabushiki Kaisha Toshiba, Tokyo, JP;
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.