Patent ID: 7168624

Claim:
An IC card, comprising: an antenna for receiving alternate current superposed with an information signal; a rectifier circuit for receiving the alternate current received by said antenna and outputting rectifier voltage to obtain a direct power supply; a voltage controlling circuit for receiving the rectifier voltage outputted from said rectifier circuit and outputting an operating voltage which is a voltage difference between a first potential and a second potential; an internal circuit to which said operating voltage is supplied; and an operating current detector circuit for detecting current supplied by said operating voltage and outputting a detection signal indicating whether or not the current is higher than a predetermined current value, wherein an operation/non-operation of said internal circuit is controlled by said detection signal, and wherein said rectifier circuit, said voltage controlling circuit, said internal circuit, and said operating current detector circuit are formed as a monolithic semiconductor integrated circuit on a silicon substrate, and said semiconductor integrated circuit is mounted on a wiring circuit board on which said antenna is formed as an antenna coil by a wiring pattern and these are sealed with resin.