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:
Apr. 03, 2012
Filed:
Jun. 08, 2010
Yasuo Kitayama, Chitose, JP;
Hiroyuki Demura, Chitose, JP;
Yasuo Kitayama, Chitose, JP;
Hiroyuki Demura, Chitose, JP;
Nihon Dempa Kogyo Co., Ltd, Tokyo, JP;
Abstract
A low noise voltage-controlled oscillating circuit which can remove a power source noise to improve low frequency noise characteristics is disclosed. A capacitor Cis provided between a base of a driving transistor Qand GND, whereby a low frequency noise input into the base can be removed. As the driving transistor Q, a transistor having a low hFE is used, whereby the low frequency noise input from a power source can be removed. A coil Lis provided on the emitter side of an oscillating transistor Q, whereby broadband frequency characteristics can be obtained to improve phase noise frequency characteristics. On the emitter side of the oscillating transistor Q, a resonance frequency in a resonant circuit having a capacitor Cand the coil Lis set near the center of a VCO oscillation frequency band, whereby it is possible to obtain the oscillation frequency which is not easily influenced by the noise.