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:
Feb. 21, 2023
Filed:
Sep. 15, 2022
Everpro Technologies Company Limited, Hubei, CN;
Jinfeng Tian, Beijing, CN;
Yan Li, Beijing, CN;
EVERPRO TECHNOLOGIES COMP ANY LIMITED, Wuhan, CN;
Abstract
A method of frequency search and error correction of clock and data recovery circuit, comprising: initializing a frequency search algorithm parameter; processing a frequency error parameter UP/DN signals according to the set algorithm parameter and starting the frequency search, in which, the algorithm accordingly counts the UP/DN signals. When a phase error signal transition occurs, a transition parameter JUMP is accumulated by 1, and an accumulation parameter SUM is obtained and is further judged that whether a frequency search result is to be output. Number of repeating times of verification and threshold parameters are set, accordingly a reset DCRL value is obtained to verifies a frequency locking result and outputs the result. The present invention improves accuracy of UP/DN pulse counting, increases stability and reliability of the frequency locking, avoids a false locking in the frequency locking, and prevents an excessive locking time in the frequency locking, overcomes error judgment of the frequency search caused by a random jitter, and correctly completes the frequency search and locking, avoids failure of the CDR caused by an error frequency locking.