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:
Oct. 10, 2006
Filed:
Sep. 02, 2005
Brian J. Minnis, Crawley, GB;
Paul A. Moore, Seaford, GB;
Brian J. Minnis, Crawley, GB;
Paul A. Moore, Seaford, GB;
Koninklijke Philips Electronics N.V., Eindhoven, NL;
Abstract
A radio receiver is configurable to operate in both low-IF and zero-IF modes with maximum re-use of of analogue and digital circuitry between modes. The receiver comprises a quadrature down-converter () for generating in-phase (I) and quadrature (Q) signals at an intermediate frequency and a complex filter () for performing image rejection filtering. In the low-IF mode, one of the outputs (Q) of the filter () is terminated, the other (I) is digitised by a non-complex ADC (), then the digital signal is filtered and decimated. Quadrature-related IF signals are then re-generated before down-conversion and demodulation. In the zero-IF mode, both outputs of the filter () are digitised and processed in parallel before demodulation. By enabling analogue-to-digital conversion and channel filtering to be performed at low-IF on non-complex signals, use of just two non-complex ADCs () is possible, thereby avoiding duplication of circuitry and providing significant power savings.