| 摘要 |
<p>A semiconductor integrated circuit device for a non-contact type IC card equipped with a rectifying circuit (16) rectifying a received signal and thus producing a power supply voltage is disclosed. A shunt regulator (22) is connected between a power supply voltage and ground, and controls a shunt resistance. A control circuit (23) controls the shunt regulator (22) as follows. The shunt resistance gradually decreases when the power supply voltage becomes higher than an upper limit of a reference voltage range, and gradually increases when the power supply voltage becomes lower than a lower limit thereof. The shunt resistance remains constant when the power supply voltage falls within the reference voltage range. <IMAGE></p> |
