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公开(公告)号：FR2840742A1
公开(公告)日：2003-12-12
申请号：FR0207000
申请日：2002-06-06
Applicant: ST MICROELECTRONICS SA
Inventor： ENGUENT JEAN PIERRE
IPC: G06K17/00 , G06K7/00 , H03D5/00 , H04B1/59 , H04B5/02 , H03D9/00 , G08C17/04 , G08C19/02 , G08C19/12 , G06K7/08 , H04L27/06 , H04L27/22
Abstract: The demodulation of a signal emitted by the transponder detects (7) a magnitude (I) which is a function of the transponder loading on a resonant circuit (L1,C1). Parallel phase (6) and amplitude (22) demodulators receive the signal from the detector (7), and their outputs are added (29). A delay (31) in the amplitude demodulator path compensates differences in propagation time.
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公开(公告)号：FR2792130B1
公开(公告)日：2001-11-16
申请号：FR9904547
申请日：1999-04-07
Applicant: ST MICROELECTRONICS SA
Inventor： WUIDART LUC , BARDOUILLET MICHEL , ENGUENT JEAN PIERRE
IPC: G08C17/00 , G01S13/75 , G01S13/76 , G01S13/79 , G06K7/00 , G06K17/00 , G06K19/07 , H02J17/00 , H04B1/59 , H04B7/14
Abstract: The transponder includes capacitor-transistor pairs (C3,K1,C4,K2) that produce an information when the transponder is close reading-writing terminal. The oscillating circuit of the transponder has a given frequency. The transmission of the information this position does not match since the frequency is higher than that of the oscillating circuit. An Independent claim is included for: (a) a system of data transmission
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公开(公告)号：FR2792135B1
公开(公告)日：2001-11-02
申请号：FR9904548
申请日：1999-04-07
Applicant: ST MICROELECTRONICS SA
Inventor： WUIDART LUC , BARDOUILLET MICHEL , ENGUENT JEAN PIERRE
Abstract: The coupling between transponder and terminal is reduced by altering the resonant frequency of either the terminal or transponder coupling circuits when the two are in close proximity. When the coupling is reduced, the data rate for the communication between terminal and transponder is automatically increased, which can be achieved because the coupling is effectively a transformer coupling.
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公开(公告)号：FR2792132B1
公开(公告)日：2001-11-02
申请号：FR9904544
申请日：1999-04-07
Applicant: ST MICROELECTRONICS SA
Inventor： WUIDART LUC , BARDOUILLET MICHEL , ENGUENT JEAN PIERRE
Abstract: The terminal (1) uses inductive coupling to read from and write to a transponder, and includes a resonant circuit (Li,Ci) tuned to receive an AC HF excitation voltage. The resonant frequency may be altered so as to detune the LC in the event that a transponder is very close to the terminal. A capacitor (24) may be controlled by a control circuit (21) and with impedance (Li) to detect a gap of phase in relation to the signal of REF reference and to modify the capacity Ci of the capacitor (24). An Independent claim is included for a contactless system of data transmission.
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Patent Agency Ranking
公开(公告)号：FR2792137A1
公开(公告)日：2000-10-13
申请号：FR9907024
申请日：1999-05-31
Applicant: ST MICROELECTRONICS SA
Inventor： WUIDART LUC , BARDOUILLET MICHEL , ENGUENT JEAN PIERRE
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公开(公告)号：FR2871312A1
公开(公告)日：2005-12-09
申请号：FR0451094
申请日：2004-06-03
Applicant: ST MICROELECTRONICS SA
Inventor： ENGUENT JEAN PIERRE
Abstract: L'invention concerne un procédé de modulation de données (D) à transmettre par un transpondeur électromagnétique (10') au moyen d'au moins un élément (18) de modulation résistif et/ou capacitif de la charge d'un circuit oscillant qu'il comporte, consistant à combiner, par une fonction involutive (19), le flux de données à transmettre avec une séquence d'étalement de spectre (ci(t)), ladite séquence étant sélectionnée en fonction d'un message de configuration (SRFU) reçu d'une borne de lecture-écriture (1')
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公开(公告)号：FR2796782A1
公开(公告)日：2001-01-26
申请号：FR9909564
申请日：1999-07-20
Applicant: ST MICROELECTRONICS SA
Inventor： WUIDART LUC , ENGUENT JEAN PIERRE
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公开(公告)号：FR2792136A1
公开(公告)日：2000-10-13
申请号：FR9904549
申请日：1999-04-07
Applicant: ST MICROELECTRONICS SA
Inventor： WUIDART LUC , BARDOUILLET MICHEL , ENGUENT JEAN PIERRE
Abstract: A terminal (40) and a transponder (10) contain a corresponding oscillating circuit (Li,Ci,24,L2,C2). An AM transmission of a signal sends a boundary-mark toward the transponder a signal (Rx) undergo a phase demodulation in the boundary-mark. The depth o modulation (tm) of the amplitude is lower than 100%. An Independent claim is included for: (a) a terminal for performing a claimed method (b) a transponder
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公开(公告)号：FR2792130A1
公开(公告)日：2000-10-13
申请号：FR9904547
申请日：1999-04-07
Applicant: ST MICROELECTRONICS SA
Inventor： WUIDART LUC , BARDOUILLET MICHEL , ENGUENT JEAN PIERRE
IPC: G08C17/00 , G01S13/75 , G01S13/76 , G01S13/79 , G06K7/00 , G06K17/00 , G06K19/07 , H02J17/00 , H04B1/59 , H04B7/14
Abstract: The transponder includes capacitor-transistor pairs (C3,K1,C4,K2) that produce an information when the transponder is close reading-writing terminal. The oscillating circuit of the transponder has a given frequency. The transmission of the information this position does not match since the frequency is higher than that of the oscillating circuit. An Independent claim is included for: (a) a system of data transmission
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