Non-contact IC card, non-contact IC card system, and non-contact

Details Non-contact IC card, non-contact IC card system, and non-contact Non-contact IC card, non-contact IC card system, and non-contact

1996-02-29

1998-05-12

Chin, Stephen

Pulse or digital communications

Transceivers

235380, H04B 138

Patent

active

057517657

ABSTRACT:
A non-contact type IC-card with a simplified circuit arrangement which can select one of the PSK- and FSK-modulation methods at data transmission. A resonance frequency switching section is provided to halve the resonance frequency of a transmission and reception antenna. In the case of the PSK-modulation, the resonance frequency of the transmission and reception antenna is halved during one period of the original frequency at a modulation point so that the phase inverts for the phase modulation. In the case of the FSK-modulation, for the frequency modulation the frequency is switched over in accordance with the variation of the data. A PFSEL switch carries out the switching between both the modulation methods.

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