PORTABLE ELECTRONIC OBJECT FOR REMOTE INFORMATION EXCHANGE

摘要

A memory card includes a filter and comparator block (BFC) with an input terminal (BE) for receiving, during the transmission of information between the terminal and the card, an amplitude modulated voltage (VNR) with a time-varying average voltage level that varies in time, a voltage source delivering a first continuous and substantially constant bias voltage (PL1), a resistive/capacitive high pass filter (FPH) connected between the input terminal and the voltage source and with a cut-off frequency in the range between the variation frequency of the average voltage level and the modulation frequency, and a comparator (CP) having a first input connected to the voltage source and a second input connected to the common terminal of the filter capacitor and resistor.