Semiconductor integrated circuit device and contactless electronic device

A contactless electronic device comprising:

• an antenna for receiving a signal and electric power;
• a power supply circuit for producing an internal voltage from the electric power received by said antenna;
• an inner circuit operated by said internal voltage produced by said power supply circuit to make processing of the signal received by said antenna and preservation of data;
• and
• a communication circuit operated by said internal voltage produced by said power supply circuit to make reception and transmission of a signal through said antenna;
• said power supply circuit including:
• first and second input terminals applied with an AC voltage produced by said antenna;
• a first rectification transistor having a drain (or collector) terminal connected to said second input terminal and gate (or base) and drain (or collector) connected through first resistor means and for supplying a rectified current between said first and second input terminals;
• a first voltage controlled current source for producing a current in accordance with a control voltage to supply said current to said first resistor means;
• and
• first voltage detection means for producing said control voltage so that a rectified voltage obtained on the side of said source (or emitter) terminal of said first rectification transistor is equal to a predetermined reference voltage.