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. 09, 2003
Filed:
Jul. 21, 1999
Thad J. Genrich, Aurora, CO (US);
Raytheon Company, Lexington, MA (US);
Abstract
An apparatus for quadrature tuner error correction includes an offset correction circuit adapted to receive a digital in-phase signal and a digital quadrature signal from a quadrature tuner. The offset correction circuit has an in-phase circuit comprising a summer adapted to receive the digital in-phase signal, subtract an in-phase offset estimate therefrom, and generate an offset corrected in-phase signal, and a feedback loop adapted to integrate the offset corrected in-phase signal, multiply the integrated offset corrected in-phase signal by a first adjustable constant, and generate the in-phase offset estimate. The offset correction circuit has a quadrature circuit comprising a summer adapted to receive the digital quadrature signal, substract a quadrature offset estimate therefrom, and generate an offset corrected quadrature signal, and a feedback loop adapted to integrate the offset corrected quadrature signal, multiply the integrated offset corrected quadrature signal by a second adjustable constant, and generate the quadrature offset estimate.