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:
Jan. 13, 2004
Filed:
Mar. 24, 2000
Nadim Khlat, Cugnaux, FR;
Patrick Clement, Bussigney, CH;
Motorola, Inc., Schaumburg, IL (US);
Abstract
Apparatus for receiving and processing a wanted Radio Frequency signal comprises a radio frequency to intermediate frequency down-conversion stage for receiving the wanted radio frequency signal and out-putting a complex intermediate frequency signal; an analogue to digital converter for converting the complex intermediate frequency signal to a digital complex intermediate signal; an intermediate frequency to base-band down-conversion stage for receiving the digital complex intermediate frequency signal and out-putting a digital complex base-band signal; and a complex notch filter for receiving the digital complex base-band signal and out-putting a notch filtered digital complex base-band signal wherein the complex notch filter substantially filters out a small portion of the base-band signal centred about a first, non-zero, frequency while substantially passing a corresponding portion of the base-band signal centred about a second frequency having the same magnitude but opposite sign to the first frequency.