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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.:

US 4287480 B1

PDFFull Text
Date of Patent:
Sep. 01, 1981

Filed:

Jan. 10, 1980

Phase locked loop out-of-lock detector

Applicant:
Inventors:

Billy K Swift, Phoenix, AZ (US);

Anthony F Zizzo, Phoenix, AZ (US);

Willard A Blevins, Glendale, AZ (US);

Assignee:

Sperry Corporation, New York, NY (US);

Attorneys:

Terry; Howard P.

McGrath; Richard J.

Primary Examiner:

Siegfried H Grimm

Int. Cl.
CPC ...
H03L / ;
U.S. Cl.
CPC ...
331 / ; 331 14 ; 331 25 ; 331D / ;
Abstract

The out-of-lock condition of a digital phase locked loop is detected during a plurality of states such that single bit discrepancies, such as a noise pulse, are ignored, and thus the tolerable range of phase detection error is broadened. The present invention is adaptable for use with typical applications of digital phase locked loops, and can be used to control the phase detector of the digital phase locked loop such that error voltages will be introduced into the loop only during selected states.

Find Patent Forward Citations

Swift, Billy. (1981). Phase locked loop out-of-lock detector (U.S. Patent No. 4287480). U.S. Patent and Trademark Office. https://idiyas.com/patent/badge/4287480

Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile

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