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:
Jun. 10, 2003
Filed:
Aug. 19, 1999
Paul A. Moore, Seaford, GB;
Michael E. Barnard, Redhill, GB;
Astrid Paula Maria Schweer, Nürnberg, DE;
U.S. Philips Corporation, New York, NY (US);
Abstract
A low IF receiver suitable for use in cellular and cordless telephones and TV tuners, comprises input signal receiving means( ), quadrature related frequency down conversion means including first and second mixing means( ) having first inputs( ) coupled to the input signal receiving means and a local oscillator means( ) for generating a local oscillator signal having a frequency offset from a nominal centre frequency of the input signal coupled to second inputs( ) of the first and second mixing means, a channel selectivity polyphase filtering means( ) for selecting a wanted channel signal from outputs of the first and second mixing means, means( ) for detecting when the quality of the frequency down converted signal becomes unacceptable due a large adjacent channel interfering component and means responsive to said detection for changing the local oscillator frequency by at least twice the low IF or one channel bandwidth to displace the large interfering component outside the bandwidth of the channel selectivity polyphase filtering means( ) and simultaneously changing the centre frequency of the polyphase filter.