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:
Sep. 12, 1995
Filed:
Mar. 03, 1993
Applicant:
Inventors:
Mitsuo Kakuishi, Kawasaki, JP;
Yutaka Awata, Kawasaki, JP;
Assignee:
Fujitsu Limited, Kanagawa, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H03D / ;
U.S. Cl.
CPC ...
375376 ; 375371 ; 331 / ; 327159 ;
Abstract
A digital loop filter includes a first loop filter for generating first phase control information at variable time intervals on the basis of phase error information indicating a phase difference between a first signal and a second signal. A second loop filter detects a frequency deviation between the first and second signals from the phase error information and generates second phase control information with a period inversely proportional to the frequency deviation. An adder generates finalized phase control information obtained by adding the first phase control information and the second phase control information to each other.