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. 17, 2011
Filed:
Nov. 30, 2006
Seiji Watanabe, Kyoto, JP;
Takashi Oka, Osaka, JP;
Tetsuo Arakawa, Osaka, JP;
Panasonic Corporation, Osaka, JP;
Abstract
A multi-phase oscillator includes a plurality of ring oscillators () each having a plurality of output ports and each formed by connecting an odd number of inverters () in a ring, and a plurality of resistance elements () coupling the output ports between the plurality of ring oscillators () so that all of the plurality of ring oscillators () operate at an identical frequency while keeping a desired phase relationship. The number of the ring oscillators () is not limited to an odd number but may be an even number. The multi-phase oscillator changes the state of a succeeding node of a phase coupling to accord with the state of a preceding node of the phase coupling by using the resistance elements () as phase coupling devices. If resistors are used as the resistance elements (), the phase output accuracy greatly improves and high frequency oscillation is possible.