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Multi-mode cellular transceivers for LTE and LTE-Advanced

This paper presents some of the challenges unique to a multi-mode transceiver supporting LTE and LTE-Advanced. Implications of combining 2G, 3G and 4G in a single lineup are discussed. RF problems specific to 4G support are discussed and technical examples are given. Specific technical solutions are provided for duplex offset IIP2 in the receiver using calibration. Multiple transmit solutions are shown for the counter intermodulation issue resulting from the inherent single sideband transmit problem caused by low RB count signaling.