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. 27, 2018
Filed:
Apr. 08, 2016
Applicant:
Fujitsu Limited, Kawasaki-shi, Kanagawa, JP;
Inventor:
Ken Atsumi, Sendai, JP;
Assignee:
FUJITSU LIMITED, Kawasaki, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H03L 7/093 (2006.01); H03L 7/107 (2006.01);
U.S. Cl.
CPC ...
H03L 7/093 (2013.01); H03L 7/1075 (2013.01);
Abstract
A phase locked loop circuit including: a loop filter having a high cutoff characteristic and a low cutoff characteristic that are switchable, and a switching circuit configured to: detect a timing when an irregular gap of no signal, included in a input signal, does not occur, and switch, in the detected timing, a cut off characteristic of the loop filter from the high cutoff characteristic during entrainment of phase locking of a output signal with the input signal to the low cut off characteristic after the phase locking.