Contactless IC card, terminal for contactless IC card, contactless IC card system having contactless IC card and terminal

摘要

A noncontact IC card for performing data communication between the IC card and the terminal using electromagnetic waves, a noncontact IC card terminal and a noncontact IC card system are disposed and the IC card is transmitted from the terminal as soon as the IC card is actuated by the start signal from the terminal The data can be reliably received.;The selection circuit performs switching under the control of the CPU so as to select an amplifier having a small amplification factor in a movable step to receive a start signal and to select a receiver amplifier having a large amplification factor in data communication in order to exchange data signals do.;As a result, the receiving sensitivity of receiving the data signal is higher than the receiving sensitivity of receiving the starting signal.