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. 02, 2010
Filed:
Sep. 19, 2006
Tomonori Matsumuro, Kyoto, JP;
Masatoshi Sato, Gifu, JP;
Hitoshi Yasuda, Gifu, JP;
Kazumasa Takai, Gifu, JP;
Tomonori Matsumuro, Kyoto, JP;
Masatoshi Sato, Gifu, JP;
Hitoshi Yasuda, Gifu, JP;
Kazumasa Takai, Gifu, JP;
Sanyo Electric Co., Ltd., Moriguchi-shi, JP;
Abstract
This invention provides a clock switching circuit that can switch clocks without causing a hazard or a distortion of a duty ratio of the clocks. The clock switching circuit of this invention includes a first synchronization circuit that synchronizes a clock selection signal with a first clock, a second synchronization circuit that synchronizes with a second clock the clock selection signal that has been synchronized with the first clock by the first synchronization circuit and a clock selection circuit that outputs '1', that is a high level, in synchronization with the clock selection signal that has been synchronized with the first clock by the first synchronization circuit and after that selects the second clock in synchronization with the clock selection signal that has been synchronized with the second clock by the second synchronization circuit.