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:
Aug. 25, 2009
Filed:
Jul. 22, 2003
Kevin R. Boyle, Horsham, GB;
Antonius J. M. DE Graauw, Haelen, NL;
Robert F. Milsom, Redhill, GB;
NXP B.V., Eindhoven, NL;
Abstract
A multi-mode radio module () comprises a terminal () for connection to an antenna (). A transmitting branch (DCS/PCS) and a branching circuit are coupled to the terminal (). The branching circuit comprises at least a first and a second branch for receiving signals in first and second frequency bands (DCS, PCS), respectively. Each of the first and second branches comprise, respectively, a phase shifting circuit (PS, PS), a BAW or SAW band pass filter (RXF, RXF) coupled to the phase shifting circuit, the bandwidth of the filter being selected to pass a wanted signal in one of the first and second frequency bands but reject an unwanted signal in the other of the second and first frequency bands, and a low noise amplifier (LNA, LNA) coupled to an output of the band pass filter. The response of each of the band pass filters (RXF, RXF) is phase shifted to present an open circuit at the wanted frequency in the other branch. Each of the phase shifting circuits (PS, PS) is impedance transforming so that higher impedance filters can be used.