Communications: electrical – Condition responsive indicating system – Specific condition
Reexamination Certificate
2005-05-10
2005-05-10
Hofsass, Jeffery (Department: 2636)
Communications: electrical
Condition responsive indicating system
Specific condition
C340S010100, C340S010200, C340S010300, C340S010400, C340S010500, C340S010600, C340S870030, C340S870030, C340S870030, C375S359000, C375S360000, C375S361000
Reexamination Certificate
active
06891475
ABSTRACT:
The invention concerns a radio-frequency transponder (12) for contact-free identification with a reader (10), comprising: an antenna (24), an analog circuit (25) including a capacitor (32) an AC-DC converter (34), a modulator (40) and a demodulator (38), a logic control circuit (26), a storage unit (27). Said transponder (12) is designed such that: the antenna (24) and the capacitor (32) form together a resonant circuit, the clock extractor (36) processes the first signal (Tx) to extract therefrom a clock signal addressed to said modulator (38) as long as the voltage of said signal (Tx) exceeds a first threshold value, the converter (34) transforms the first signal (Tx) into a rectified signal, to power the transponder (12). The performances of the transponder, and more particularly energy recuperation and data transmission rate, are improved by the fact that the analog circuit comprises two clock extractors, one of low level type (35), the other of the high level type (36).
REFERENCES:
patent: 3590386 (1971-06-01), Tisi et al.
patent: 4931788 (1990-06-01), Creswick
patent: 5077753 (1991-12-01), Grau et al.
patent: 5313198 (1994-05-01), Hirao et al.
patent: 5345231 (1994-09-01), Koo et al.
patent: 5504485 (1996-04-01), Landt et al.
patent: 5649295 (1997-07-01), Shober et al.
patent: 6104290 (2000-08-01), Naguleswaran
patent: 6198382 (2001-03-01), Berger et al.
patent: 6272325 (2001-08-01), Wiedeman et al.
patent: 0 732 663 (1996-09-01), None
Benoit Martial
Bui Ngoc-Chau
Cassi Vincent
Chatelain Jean-Daniel
Gaudenzi Yves
Hofsass Jeffery
MBBS Holding S.A.
Pham Lam
Young & Thompson
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