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:
Feb. 07, 2012
Filed:
Sep. 22, 2009
Junichiro Yamakawa, Chitose, JP;
Kazuo Akaike, Chitose, JP;
Takashi Nakaoka, Sayama, JP;
Mikio Takano, Toshima, JP;
Yuichiro Arai, Chichibu, JP;
Junichiro Yamakawa, Chitose, JP;
Kazuo Akaike, Chitose, JP;
Takashi Nakaoka, Sayama, JP;
Mikio Takano, Toshima, JP;
Yuichiro Arai, Chichibu, JP;
Nihon Dempa Kogyo Co., Ltd, Tokyo, JP;
Abstract
A low-noise voltage controlled oscillator is provided, to improve a phase noise characteristic and widen a frequency variable range. The low-noise voltage controlled oscillator is configured so that an oscillation element and a capacitorare connected in series between a collector C and an emitter E of a transistor, capacitorsandare connected in series between the collector C and the emitter E, an electrical potential between the capacitorsandis applied to a base B of the transistor; a one-port circuitis provided between the collector C and the capacitor; and a capacitor for correctionis connected in parallel with the capacitorsand. The one-port circuitincludes a tuned circuit provided with a variable capacitor adjusting a capacity thereof smaller and an inductor adjusting a value of inductance larger so as to set a value of impedance relatively large.