International Solid-State Circuits Conference ISSCC 2009 / SESSION 6 / CELLULAR AND TUNER / 6 . 2 6 . 2 A SAW-Less Multiband WEDGE Receiver

With an ever-increasing number of frequency bands supported by cellular transceivers (TRX), front-end (FE) complexity increases due to a large number of external SAW filters. The challenge of removing inter-stage filters from multiband 3G receivers (RX) resides in the additional noise contribution due to limited transmitter (TX) leakage rejection at the RX input, intermodulation (IM) products and cross-compression due to TX leakage and strong out-ofband blockers. Increased downconverter dynamic range is thus required for a SAW-less RX path. In addition, avoiding SNR degradation from reciprocal mixing imposes additional constraints on LO phase noise.