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:
Jan. 29, 2002
Filed:
May. 17, 1999
Applicant:
Inventors:
Yuji Segawa, Hachioji, JP;
Kunihiko Gotoh, Tama, JP;
Assignee:
Fujitsu Limited, Kawasaki, JP;
Primary Examiner:
Int. Cl.
CPC ...
H03B 7/06 ; H03B 7/093 ; H03B 7/14 ;
U.S. Cl.
CPC ...
H03B 7/06 ; H03B 7/093 ; H03B 7/14 ;
Abstract
A cut-off state of a carrier signal or a carrier signal outside an effective range of a frequency is detected by a carrier detector, and a signal switching circuit inputs a clock from an external device into a phase comparator in place of the carrier signal, with which a locked state is maintained in a PLL comprising the phase comparator, a charge pump, a loop filter, a voltage control oscillator, and a 1/N divider, so that a high-speed locking operation is realized to another appropriate carrier signal.