IC CARD AND SEMICONDUCTOR DEVICE

摘要

In an IC card, which operates by alternating current power supplied from a reader writer by wireless, voltage drop of bridge-connected switch elements which rectify the power is suppressed and power deterioration is prevented. An antenna (1a) receives power from the reader writer. The switch elements (SW1-SW4) are bridge-connected and rectify the power received by the antenna (1a). Antennas (1b, 1c) are connected in series to the both edges of the antenna (1a) to receive power, and turn on and off the switches (SW3, SW4). Since the enough power to turn on the switches can be supplied to the switch elements (SW3, SW4), the voltage drop of the switch elements (SW3, SW4) can be suppressed and the power deterioration can be prevented.