|Digital Radio transmission for applications such as short distance radio links is coming closer to reality. A significant effort is however still needed to port Digital Radio to Cellular. The major bottleneck towards the "software radio" is the high-frequency part of the radio transceiver. Analog-to-digital or digital-to-analog conversion right at the antenna is far beyond what state of the art technology is able to deliver. An alternative solution to bring the digital-to-analog interface closer to the antenna in the transmitter is using bandpass delta-sigma modulation. The reconfigurability of such a transmitter for multi-mode communication systems depends on the availability of appropriate high-power RF filters and on the reconfigurability of the power amplifier to address different bandwidths and power requirements. The objective of MOBILIS is two-fold: develop a robust and cost-effective integrated high-power RF filtering technology and demonstrate, based on that technology, the feasibility of a mixed SoC (nanometric CMOS/system integration) and SiP (BiCMOS/power-BAW) RF power transmitter. The targeted transmitter is based on a Digital Radio transmitter architecture and addresses both the WCDMA and DCS standards. To reach this objective, a series of intermediate technological objectives will be achieved: - Investigation of above IC integration of new materials on 200 mm wafers, - Investigation of the power handling capabilities of the BAW technology, - Development of a new non-linear SMR-type BAW model, - Implementation of the new model in a CAD software for power-BAW filter design, - Integration of two band filters on the same wafer, - Development of a reconfigurable power amplifier, - Development of integrated test-benches at the circuit and system levels.
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