| 摘要 |
A non-contact information storage medium for receiving power from a card reader/writer via an antenna, using the power for driving its internal circuit, and simultaneously transmitting data as a transmission wave to the outside thereof. The output current of a rectifier circuit is interrupted by a switching circuit incorporated in a modulation circuit in accordance with the transmission wave. In the period of interruption, the output voltage of the rectifier circuit is limited by a voltage limiting circuit incorporated in the modulation circuit to a value not more than the breakdown voltage of elements which constitute the circuit. The loss of power during data transmission is extremely small, and hence the circuit can be constituted by elements of a usual breakdown voltage.
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