Subject : Study and demonstration of highly-integrated FDSOI CMOS digital transmitters for emerging 802.11ah IoT standards
The emerging Internet of Things (IoT) communication markets demand wireless networking standards that operate in the sub-1 GHz spectrum, providing long-range and low-power operation, such as 802.11ah and 802.11af. In the collaborative works ST-IEMN, digital transmitters has been recently targeted to replace traditional RF architectures, due to their high configurability, efficiency and integration. This thesis subject proposes to demonstrate entirely digital transmitter architectures to efficiently target sub-1 GHz communication systems. The proposed works will leverage the use of UTBB FDSOI unique features, aiming state-of-the-art performance.
Advanced CMOS technologies offer very nice switches that can enable wideband and highly-integrated digital transmitters relying on timing rather than voltage levels. Features of the 28nm FDSOI technology also provide an additional design space to introduce configurability in digital transmitters, providing a good opportunity to address the bandwidth and carrier frequency configurability demands. This work will follow up on previous PhD works on digital transmitters in the ST-IEMN common lab. Potential solutions to be investigated include time-interleaved delta-sigma modulation, FIR-DACs, switched capacitor amplifier and digital RF pulse position and width modulation.
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