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. 26, 2008
Filed:
Dec. 30, 2004
Hirohito Higashi, Kawasaki, JP;
Hideki Ishida, Kawasaki, JP;
Hirohito Higashi, Kawasaki, JP;
Hideki Ishida, Kawasaki, JP;
Fujitsu Limited, Kawasaki, JP;
Abstract
An oscillator for ensuring the phase relationship between two resonant circuits coupled by a coupling circuit. A first resonant circuit outputs two signals having different phases, and a second resonant circuit outputs two signals having different phases. The coupling circuit includes a plurality of inverters connected in a ring manner, and couples the first resonant circuit and the second resonant circuit such that the two signals output from the first resonant circuit and the two signals output from the second resonant circuit have different phases. A filter is connected to the input side of each of the plurality of inverters. With this structure, a signal output from each of the plurality of inverters has either a phase lead or a phase lag according to the phase characteristics of the corresponding filter, and thus the phase relationship between the first resonant circuit and the second resonant circuit is ensured.