Radiofrequency interface device for a transponder

H - Electricity – 04 – B

Patent

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Details

H04B 1/59 (2006.01) G01S 13/75 (2006.01) G06K 7/00 (2006.01) H02M 7/10 (2006.01)

Patent

CA 2228697

A radiofrequency interface device (1) for a transponder, comprising a coil (2) forming the transponder antenna and a voltage converter circuit (4) connected both to the terminals (5, 6) of said coil (2) and to the DC voltage supply terminals (Vdd, Vss) of an integrated logic circuit (7) of the transponder. The terminals (5, 6) of said coil (2) are connected to potentials that float relative to the transponder substrate, so that the potential of any one of the terminals (5, 6) of the coil (2) does not fall below the potential (Vss) of the substrate.

Ce dispositif (1) d'interface radiofréquence d'un transpondeur, comporte une bobine (2) formant l'antenne du transpondeur et un circuit convertisseur de tension (4) connecté d'une part aux bornes (5, 6) de ladite bobine (2) et d'autre part aux bornes (Vdd, Vss) d'alimentation en tension continue d'un circuit logique intégré (7) du transpondeur, et est caractérisé en ce que les bornes (5, 6) de la bobine (2) sont connectées à des potentiels flottants par rapport au substrat du transpondeur, de sorte que le potentiel d'aucune des bornes (5, 6) de la bobine (2) ne passe en-dessous du potentiel (Vss) du substrat.

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