Non-contact IC card, terminal for use with the non-contact IC ca

Details Non-contact IC card, terminal for use with the non-contact IC ca Non-contact IC card, terminal for use with the non-contact IC ca

1993-12-20

1995-08-22

Hajec, Donald

Registers

Systems controlled by data bearing records

Credit or identification card systems

235449, 235492, G06K 500

Patent

active

054442222

ABSTRACT:
A non-contact IC card, a non-contact IC card terminal and a non-contact IC card system for performing data communication between the IC card and the terminal by using electromagnetic waves are arranged so that the IC card can reliably receive data transmitted from the terminal once the IC card is started up by a startup signal from the terminal. A selection circuit, under the control of a CPU selects a receiving amplifier having a smaller amplification factor in a startup step for receiving the startup signal and a receiving amplifier having a larger amplification factor in a data communication step for exchanging data signals. The sensitivity with which the data signal is received is thereby increased relative to the sensitivity with which data signals are received.

REFERENCES:
patent: 4845347 (1989-07-01), McCrindle et al.
patent: 5157247 (1992-10-01), Takahira
patent: 5225667 (1993-07-01), Furuta

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