| 摘要 |
<p>An IC card having two coupling coils (4, 5), two rectifier circuits (6, 7), internal circuits (20, 21, 22, 23), a voltage-adjusting circuit (8), a reset-signal generating circuit (8), and a wave-selecting circuit (13). The coils receives two carrier waves which are shifted in phase by 90 DEG . The rectifier circuits rectify the carrier waves, generating direct-current voltages for the internal circuits. The voltage-adjusting circuit adjusts the direct-current voltages to a voltage of a predetermined value. The reset-signal generating circuit has hysteresis. The wave-selecting circuit selects one of the carrier waves and outputs the selected wave as a system clock signal. The system clock signal is stable, and the internal circuits can perform stable operations. The IC card can stably operate to receive data and transmit data. Furthermore, the IC can be easily made in the form of an LSI. <MATH></p> |
