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:
Mar. 11, 2008
Filed:
Jan. 15, 2004
Supat Wongwirawat, Langhorne, PA (US);
Azzedine Touzni, Doylestown, PA (US);
Mark Hryszko, Doylestown, PA (US);
Raul A. Casas, Doylestown, PA (US);
Yiwen Yu, Holland, PA (US);
Supat Wongwirawat, Langhorne, PA (US);
Azzedine Touzni, Doylestown, PA (US);
Mark Hryszko, Doylestown, PA (US);
Raul A. Casas, Doylestown, PA (US);
Yiwen Yu, Holland, PA (US);
ATI Technologies Inc., Thornhill, Ontario, CA;
Abstract
A digital receiver, that may be used to receive VSB/QAM digital television signals, includes an adaptive fine carrier recovery circuit that compensates for deviations in the carrier frequency or phase. The carrier recovery circuit de-rotates a signal including phase errors. Estimations of phase errors are filtered using a filter whose gain and bandwidth are adjusted adaptively. This allows the carrier recovery circuit to track phase/frequency offset without introducing significant jitter. In one embodiment, the receiver includes a DFE, and the adaptive carrier recovery circuit mitigates instability that might be associated with the DFE.