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. 07, 2006
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-directed frequency-and-phase lock loop for an offset-QAM modulated signal comprises a first multiplier that multiplies the signal by the output of a VCO. The output of the first multiplier is phase-shifted by a second multiplier, then convolved by a third multiplier. The output of the third multiplier is split, with each portion being passed through a frequency-shift multiplier and a frequency-and-phase lock loop. The output of the two frequency-and-phase lock loops is summed and returned to the VCO to complete the feedback loop.