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Low power consumption non-contact integrated circuit card

  • US 5,182,442 A
  • Filed: 08/09/1990
  • Issued: 01/26/1993
  • Est. Priority Date: 03/13/1990
  • Status: Expired due to Term
First Claim
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1. A non-contact IC card comprising:

  • data transmit-receive means including an antenna for transmitting a response signal to and receiving trigger and request signals from a terminal unit, a modulation circuit for modulating response signals for transmission form said antenna, and a demodulation circuit for demodulating trigger and request signals received through said antenna, said modulation and demodulation circuits being connected to said antenna, said demodulation circuit including detection means for discriminating between a trigger signal having a first magnitude in signals received through said antenna by said data transmit-receive means;

    data memory means for storing data;

    data processing means connected to said data memory means and to said data transmit-receive means for processing data stored in said data memory means in response to a request signal and for outputting a response signal based on the data processing;

    clock signal generating means for generating and supplying a clock signal to said data processing means, connected to said data processing means and said data transmit-receive means and including actuating means for actuating said clock signal generating means when said detection means detects a trigger signal in a signal received by said data transmit-receive means through said antenna, wherein said clock signal generating means includes a clock signal generating circuit having first stop means for stopping generation of the clock signal by said clock signal generating means after (i) actuation of said clock signal generating means by said actuating means, (ii) data processing by said data processing means, said (iii) output of a response signal by said data processing means to the terminal unit through said data transmit-receive means and said antenna; and

    a battery for supplying electrical power to said data transmit-receive means, data memory means, data processing means, and clock signal generating means.

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