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US 2002/0077061 A1Published application
Inductive coupling data send/receive circuit
AssigneeInside Technologies
InventorBruno Charrat
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AssigneeInside Technologies
InventorBruno Charrat
Estimating the term…
The invention relates to an inductive coupling data receiving device (30), comprising an inductive-type antenna circuit (10) having a coil (11) through which an antenna signal (Sa) passes, and a control circuit (2) comprising binary ports (P1-P7) that can be set to high impedance (HZ). According to the present invention, the device comprises at least two filters (31, 32) arranged to receive a charge modulation signal (Sx), that is present in the antenna signal (Sa), on a first terminal, each connected by their other terminal to a control circuit (2) port (P5, P6). The control circuit is arranged to select one of the filters by setting the port connected to the filter to be selected to “1”, and by setting the port connected to the other filter to high impedance state. Particularly applied to contactless smart card readers.
Charge modulation and inductive coupling data receiving device (30), comprising an inductive-type antenna circuit (10) having a coil (11) through which an antenna signal (Sa) passes, and a control circuit (2) comprising binary ports (P1-P7) that can be set to high impedance (HZ), characterised in that it comprises at least two filters (31, 32) each connected by one of their ends to a control circuit (2) port (P5, P6), means (33, 34, 35, 36, 37) for applying a charge modulation signal (Sx), that is present in the antenna signal (Sa), to the other end of the filters, and in that the control circuit is arranged to select one of the filters by setting the port connected to the filter to be selected to “1” and by setting the port connected to the other filter to high impedance state.
Device according to one of the previous claims, comprising an oscillator (3) delivering an alternative signal (S1) and switch means (22) controlled by the alternative signal (S1), arranged at the terminals of the antenna coil (11) to modulate the frequency of the antenna signal (Sa).
Dependencies are inferred from the claim text.