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:
Apr. 03, 2007
Filed:
Apr. 24, 2003
Xiaohui LI, College Station, TX (US);
Henry Kin-chuen Kwok, Fremont, CA (US);
Xiaohui Li, College Station, TX (US);
Henry Kin-Chuen Kwok, Fremont, CA (US);
Texas Instruments Incorporated, Dallas, TX (US);
Abstract
The present invention provides a solution that eliminates both the voltage-controlled oscillator ('VXCO') and its associated D/A converter () from the timing recovery scheme, thereby significantly reducing manufacturing costs for modems, such as asymmetric digital subscriber loop ('ADSL') modems. The present invention also enables tracking of a wider frequency offset. The present invention provides this with a novel timing recovery scheme implemented entirely in the digital domain. The present invention includes a free running clock () as the sampling clock for the A/D () and D/A () converters, and interpolators (and) to correct timing errors for both the receive and transmit samples. The desired sample can be obtained based on its timing offset and its neighboring samples.