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RESPONDER, INTEGRATED CIRCUIT CHIP, NONCONTACT IC CARD, AND SELF POWER NEEDLESS TYPE DEVICE IN NONCONTACT IC CARD COMMUNICATION SYSTEM, AND AUTOMATIC ADJUSTMENT METHOD FOR SELF POWER NEEDLESS TYPE DEVICE
RESPONDER, INTEGRATED CIRCUIT CHIP, NONCONTACT IC CARD, AND SELF POWER NEEDLESS TYPE DEVICE IN NONCONTACT IC CARD COMMUNICATION SYSTEM, AND AUTOMATIC ADJUSTMENT METHOD FOR SELF POWER NEEDLESS TYPE DEVICE
In a non-contact IC card, a driving portion 5 sequentially switches a resonance frequency of a resonance circuit 1. A reference voltage generating portion 6 receives an output voltage of resonance circuit 1 for outputting a prescribed reference voltage. An output value measuring portion 7 measures a magnitude of the output voltage of resonance circuit 1 at each resonance frequency using the reference voltage as a reference. An output value storing portion 8 stores a measurement value (an output value). A manner determining portion 9 selects the largest one of the output values stored in output value storing portion 8, and determines a switching manner corresponding thereto as a suitable switching manner. Thus, the suitable switching manner allowing the most efficient power supply can be achieved.
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