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:
Nov. 03, 1998
Filed:
Nov. 28, 1995
Applicant:
Inventor:
Gilbert R Woodman, Jr, Santa Clara, CA (US);
Assignee:
International Business Machines Corporation, Armonk, NY (US);
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H03D / ;
U.S. Cl.
CPC ...
375376 ; 375371 ; 375374 ; 375375 ; 331 18 ; 331 25 ;
Abstract
A phase-locked loop implemented in all-digital components uses a stochastic approach to detect errors in phase position and relative velocity. Using a history circuit and an adjustment-intensity selection circuit appropriate corrections in phase and frequency are made. The history circuit keeps a running record of a series of binary results (0 or 1) as received from a phase comparator. History components collected include the number of consecutive oscillator periods in which the phase offset (0 or 1) has remained the same and the number of oscillator periods in which the phase offset count has not exceeded 1.