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. 01, 2003
Filed:
Aug. 02, 1999
Applicant:
Inventors:
Assignee:
Nortel Networks Limited, St-Laurent, CA;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H04B 1/10 ;
U.S. Cl.
CPC ...
H04B 1/10 ;
Abstract
A method and apparatus for performing image rejection filtering in a radio signal processing device. In a specific example of implementation, the apparatus is a radio transceiver that includes a transmitter and a receiver, each comprising an image rejection filter. A control signal, already available in the usual radio transceiver architecture, is used to simultaneously tune the LO frequency of the transceiver and the image rejection frequency of the image rejection filters. The image rejection filters are designed such that their image reject frequency accurately tracks the Local Oscillator (LO) frequency of the transceiver over a range of frequencies.