Method and device for transmitting data by charge modulation

Details Method and device for transmitting data by charge modulation Method and device for transmitting data by charge modulation

G - Physics

06

K

G06K 19/07 (2006.01)

Patent

CA 2651297

Contactless data transmission device (DV1) comprising an antenna circuit (ACT) supplying AC voltage (VA1) in the presence of an alternating excitation field (FLD), and a charge modulation transistor (SW) having a control terminal receiving a charge modulation signal having at least one low state and one high state, and a conduction terminal receiving the AC voltage (VA1). According to the invention, the device includes means (BCT) for supplying a DC overvoltage (Vppl) greater than a peak value of the alternating voltage (VA1) supplied by the antenna circuit, and means (VCT) for applying a charge modulation signal (Slm2) to the control terminal of the charge modulation transistor (SW) which, in the high state, has a voltage level equal to the DC overvoltage (Vppl).

Dispositif de transmission de données sans contact (DVl) comprenant un circuit d'antenne (ACT) fournissant une tension alternative (VAl) en présence d'un champ d'excitation alternatif (FLD), et un transistor de modulation de charge (SW) ayant une borne de contrôle recevant un signal de modulation de charge présentant au moins un état bas et un état haut, et une borne de conduction recevant la tension alternative (VAl). Selon l'invention, le dispositif comprend des moyens (BCT) pour fournir une tension continue survoltée (Vppl) supérieure à une valeur crête de la tension alternative (VAl) fournie par le circuit d'antenne, et des moyens (VCT) pour appliquer à la borne de contrôle du transistor modulation de charge (SW) un signal de modulation de charge (Slm2) qui présente à l'état haut un niveau de tension égal à la tension continue survoltée (Vppl).

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