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. 23, 2013
Filed:
Jan. 06, 2009
Anthony Eugene Zortea, Pipersville, PA (US);
Mathew Mcadam, Vancouver, CA;
Mathieu Gagnon, Verdun, CA;
Graeme Boyd, North Vancouver, CA;
Winston Ki-cheong Mok, Vancouver, CA;
Anthony Eugene Zortea, Pipersville, PA (US);
Mathew McAdam, Vancouver, CA;
Mathieu Gagnon, Verdun, CA;
Graeme Boyd, North Vancouver, CA;
Winston Ki-Cheong Mok, Vancouver, CA;
PMC-Sierra, Inc., Sunnyvale, CA (US);
Abstract
Large interfering signals (interferers) with spectra near a desired signal can cause distortion in a wireless receiver due to a non-linear signal path. It is typically a performance advantage to attenuate these interferers earlier in the signal path, rather than later in the signal path, because these interferers can cause saturation of amplifying stages. In certain situations, the frequency offset of an interfering signal, with respect to the desired signal, can be on the order of 10 megahertz (MHz), whereas the center frequencies can be on the order of several gigahertz (GHz). Thus, a filter with 'baseband' precision would be needed at radio frequency to notch out the interferer, which is relatively difficult to do. Disclosed is a technique to estimate the relative strength and center frequency of the interferer and to place the center frequency of a notch filter adaptively and precisely at the interferer location.