| 摘要 |
PROBLEM TO BE SOLVED: To provide a semiconductor device capable of preventing degradation in characteristics and breakage of internal elements even when an communication distance is extremely short and a distance between reader/writer and RF tag suddenly comes closer, and suppressing loss of electric power to perform communication over a wide range. SOLUTION: A protective circuit is provided in the input side of the semiconductor device to make it possible to receive the electric power collected by an antenna circuit. The protective circuit utilizes a variable resistor which can change its resistance in accordance with the inputted electric power. The variable resistor is connected in series between the antenna circuit and the rear stage of the protective circuit. COPYRIGHT: (C)2008,JPO&INPIT
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