Communication device between the defendant-ID and the base station VEHICLE

摘要

This device for coupling between an identifier/transponder and a computer on board a motor vehicle comprises a resonant circuit (RA, LA, CA) with variable impedance under the effect of the identifier/transponder, which is supplied on the basis of two AC voltages (TD1, TD2) in phase opposition, and a demodulator circuit (5) for demodulating the signal from the resonant circuit. It comprises means (Rsup) for eliminating, from the signal emanating from the resonant circuit, a component corresponding to a first AC voltage from among said AC voltages (TD1, TD2).