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:
Dec. 27, 2005
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-acquisition loop capable of generating a frequency error having a magnitude and direction from a double sideband suppressed signal comprises a first multiplier that multiplies the signal by the output of a VCO. The output of the first multiplier is convolved by a second multiplier. The I output of the second multiplier passes through a first low-pass filter. The filtered I output and the Q output are then multiplied by a third multiplier. The output of the third multiplier is filtered through a second low-pass filter, amplified, and return to the VCO to complete the feedback loop.