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:
Aug. 05, 1980
Filed:
Sep. 19, 1978
Applicant:
Inventors:
Alberto Boleda, Menlo Park, CA (US);
John F Wakerly, Palo Alto, CA (US);
Assignee:
Northern Telecom Limited, Montreal, CA;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H04L / ; H04L / ;
U.S. Cl.
CPC ...
375119 ; 328 55 ; 328133 ; 235 / ;
Abstract
A digital clock recovery circuit in which the phase of the divider chain driven by a local clock is controlled in order to maintain its output (the recovered clock signal) in synchronization with the incoming data stream. Additional control circuitry is included to inhibit phase correction when the relative phase of the two signals is within certain limits. Also phase correction takes place only after several indications one signal is leading or lagging the other, to prevent any correction due to noise.