Non-contact IC card including phase-locked loop circuitry

Details Non-contact IC card including phase-locked loop circuitry Non-contact IC card including phase-locked loop circuitry

1997-08-01

1998-11-03

Hajec, Donald T.

Registers

Records

Conductive

235439, 34082534, 34082554, G06K 1906

Patent

active

058312579

ABSTRACT:
A non-contact IC card includes an antenna resonance circuit including two output terminals; and a phase locked loop (PLL) for receiving, as an input signal, a signal representative of a received signal received by the IC card and changing to a negative state, and for producing an output tuned to the input signal, wherein, for phase modulation or demodulation, an output signal for half a period is produced as the output of the PLL and both terminals of an antenna resonance circuit are short-circuited during the half period from a zero crossing point of the input signal.

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