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:
Oct. 15, 1985
Filed:
Jan. 24, 1985
Applicant:
Inventor:
Koichiro Takeda, Abiko, JP;
Assignee:
Fujitsu Limited, Kawasaki, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H04L / ; H03L / ;
U.S. Cl.
CPC ...
329 50 ; 329122 ; 331-4 ; 331 23 ; 331 25 ; 331D / ; 375 81 ; 375120 ;
Abstract
The present invention discloses a phase lock loop circuit which recovers a carrier for demodulating a PSK signal wherein a sweep signal is suspended when a decision signal indicates the phase-locked state. The level of the sweep signal is held and applied to the phase lock loop at the time the circuit becomes phase-locked, thereby an unwanted sweep signal component is no longer generated when the sweep stops. Thus stable phase-locked operation can be realized.