Architectures de systèmes monopuces en radio fréquence: solutions pour une faible consommation

RésuméCet article propose une discussion autour de la conception de radio-fréquence à 2,45 GHz destinés à des applications à faible coût. À partir de considérations liées au coût, un ensemble important de contraintes sur la conception des parties numériques, analogiques et mixtes du système est discuté. Des choix technologiques et architecturaux sont proposés, avec analyse de leur adaptation à la norme 802.15.4. Ainsi, à partir d’une approche comparative, cet article insiste sur la pertinence d’une solution basée sur la conversion directe associée à une modulation par déplacement de fréquence. Les conséquences des protocoles de communication sur la conception sont aussi discutées. On montre aussi les inconvénients de nombreuses architectures connues dans le cadre de la mise en œuvre de systèmes radio fréquence à faible coût.AbstractThis paper is a discussion on 2.45 GHzrf SoC for low cost applications. Starting from cost considerations, design of analogue, digital and mixed parts is discussed. In this context, some topologies and some technological choices are proposed. The possible use of the presented solutions in the 802.15.4 standard is also analysed. Thus, using a comparative analysis, this paper shows the interest of a Zero-if direct conversion associated withfsk modulation. The communication protocol impact on the design is also discussed. Many topology drawbacks are also highlighted for Low-costrf SoC.

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