Non-contact IC card including phase-locked loop circuitry
First Claim
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1. A non-contact IC card comprising:
- 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 and/or demodulation, an output signal for half a period is produced as the output of said 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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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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Citations
1 Claim
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1. A non-contact IC card comprising:
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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 and/or demodulation, an output signal for half a period is produced as the output of said 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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Specification
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Current AssigneeMitsubishi Denki Kabushiki Kaisha (Mitsubishi Electric Corporation), Mitsubishi Electric Corporation
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Original AssigneeMitsubishi Denki Kabushiki Kaisha (Mitsubishi Electric Corporation)
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InventorsYamaguchi, Atsuo
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Primary Examiner(s)Hajec, Donald T.
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Assistant Examiner(s)LEE, MICHAEL GUNYOUNG
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Application NumberUS08/904,360Time in Patent Office459 DaysField of Search235/492, 235/380, 235/439, 235/449, 235/454, 340/825.34, 340/825.54, 343/742US Class Current235/492CPC Class CodesG06K 19/0723 the record carrier comprisi...G06K 7/0008 General problems related to...
