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:
Sep. 18, 2007
Filed:
Apr. 01, 2003
Richard W. Citta, Oak Park, IL (US);
Scott M. Lopresto, Mount Prospect, IL (US);
Jingsong Xia, Mundelein, IL (US);
Wenjun Zhang, Shanghai, CN;
Richard W. Citta, Oak Park, IL (US);
Scott M. LoPresto, Mount Prospect, IL (US);
Jingsong Xia, Mundelein, IL (US);
Wenjun Zhang, Shanghai, CN;
Micronas Semiconductors, Inc., Palatine, IL (US);
Abstract
A data-and-pilot directed frequency-and-phase lock loop for an offset-QAM modulated signal having a pilot signal comprising a pilot acquisition loop and a pair of data-directed acquisition loops. The pilot is extracted from the main signal by a pilot filter, then used both by the pilot acquisition loop and to remove the pilot from the signal to the data-directed acquisition loops. The outputs of the pilot and the two data-directed acquisition loops are summed and returned to the VCO to complete the feedback loop.