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:
Jun. 16, 1992
Filed:
Sep. 03, 1991
Applicant:
Inventor:
Sakutaro Sato, Kawasaki, JP;
Assignee:
Fujitsu Limited, Kanagawa, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H03L / ; H03K / ; H03K / ; H03B / ;
U.S. Cl.
CPC ...
307269 ; 307511 ; 328 63 ; 328155 ; 328 72 ; 328104 ; 328137 ; 328154 ; 331 49 ;
Abstract
A clock switching apparatus includes a first phase synchronizing part for receiving n (n is an integer) input clock signals and for generating n first clock signals respectively related to the n input clock signals. Each of the n first clock signals has a frequency higher than that of a corresponding one of the n input clock signals. A selector selects one of the n first clock signals. A frequency divider generates a second clock signal obtained by frequency-dividing the one of the n first clock signals selected by the selector. A second phase synchronizing part generates an output clock signal synchronized with the second clock signal.