A memory card, capable of remotely exchanging information with a terminal by modulating a magnetic field generated by said terminal, includes a voltage limiter (LMT) with an input terminal (BE) for receiving, during the transmission of information between the terminal and the card, an amplitude modulated...http://www.google.com/patents/US6052055?utm_source=gb-gplus-sharePatent US6052055 - Portable electronic object for remote information exchange
