Patent ID: 6540147
Filing Date: 2003-04-01
Classification: G06K,H04B

Abstract:
Charge modulation and inductive coupling data receiving device (30), comprising an inductive 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 â€œ1â€  and by setting the port connected to the other filter to high impedance state.