Patent ID: 7344087

Claim:
An IC card comprising: a signal processing circuit; a modulator for performing Quadrature Amplitude Modulation (QAM) on a data signal received from the signal processing circuit and generating a transmission signal; and an antenna for transmitting the transmission signal modulated by the modulator, wherein the modulator comprises: a serial-parallel converter for converting a serial signal received from the signal processing circuit to a parallel signal; a first level converter for converting a level of a first channel signal received from the serial-parallel converter; and a first multiplier for modulating the level-converted signal received from the first level converter with a first carrier wave signal and outputting a first modulating signal; a second level converter for converting a level of a second channel signal from the serial-parallel converter; a second multiplier for modulating the level-converted signal from the second level converter with a second carrier wave signal and outputting a second modulating signal; and a synthesizer for synthesizing the first modulating signal from the first multiplier and the second modulating signal from the second multiplier.