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Clock signal generating and data signal decoding circuit of contact-less integrated circuit card

A clock signal and integrated circuit technology, applied in the direction of generating/distributing signals, electrical components, digital transmission systems, etc., can solve problems such as difficulty in maintaining a 106kps bit rate

Inactive Publication Date: 2006-11-15
SAMSUNG ELECTRONICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this case, it is difficult to maintain the bit rate of 106kps specified by the ISO / IEC 14443 Type A protocol because the synchronous clock signal for transmission and reception is generated by dividing the frequency of this clock signal with discontinuous periods

Method used

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  • Clock signal generating and data signal decoding circuit of contact-less integrated circuit card
  • Clock signal generating and data signal decoding circuit of contact-less integrated circuit card
  • Clock signal generating and data signal decoding circuit of contact-less integrated circuit card

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Experimental program
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Embodiment Construction

[0033] Preferred embodiments of the present invention will be described more fully with reference to the accompanying drawings.

[0034] Figure 4 It is a block diagram of the clock generation and data recovery circuit of the contactless integrated circuit card of the present invention. refer to Figure 4 , the clock generation and data recovery circuit is contained in the non-contact IC card, and includes the RF part 110, the clock frequency divider 120, the OR gate 130, the 3-bit counter 140, the 2-bit counter 150, the clock generator and the decoder part 160 and reset controller 170 .

[0035]The RF part 110 receives, for example, an RF signal with a frequency of 13.56 MHz and a bit rate of 106 kbps according to the ISO / IEC 14443 Type A protocol, and converts the received signal into a clock signal RF_CLK and a data signal RF_IN suitable for digital circuits. The clock divider 120 divides the frequency of the clock signal RF_CLK from the component 110 to generate the fre...

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PUM

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Abstract

The invention discloses an integrated circuit card including clock signal generation and data recovery circuits. The circuit includes: a receiver for receiving a radio frequency signal with a pause period; a frequency divider for dividing the frequency of the received signal; a first counter for dividing the period of the frequency-divided signal in each non-standstill period of the received signal counting; a second counter for counting periods of the frequency-divided signal; and a decoder for generating a synchronous clock signal and a decoded data signal in response to the outputs of the first and second counters. The second counter is reset by the synchronous clock signal. Based on the received RF signal transmitted from the card reader, the circuit is capable of generating a synchronous clock signal and decoding the received data signal to be compatible with the ISO / IEC 14443 Type A interface. The circuit provides accurate decoding results even when the pause period of the RF signal received from the card reader varies within a predetermined range.

Description

technical field [0001] The invention relates to a non-contact integrated circuit (IC) card, in particular to a circuit for generating a clock signal and recovering data from a received radio frequency signal in a non-contact IC card. Background technique [0002] Since the birth of credit cards in the 1920s, various electronic information cards such as payment (or cash) cards, credit cards, identity cards, and department store cards have been developed. Recently, an integrated circuit (IC) card, so named because a microcomputer is integrated therein, has become popular due to its convenience, stability, and numerous applications. [0003] Typically, an IC card is in the shape of a thin semiconductor device attached to a plastic card the same size as a credit card. Compared with conventional credit cards including magnetic media strips, IC cards have many advantages such as high stability, write-protected data, and high security. Therefore, IC cards are widely accepted as a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F1/12G06K19/07H04L25/49
CPCG06K19/07786G06K19/0723H04L25/491
Inventor 金基烈
Owner SAMSUNG ELECTRONICS CO LTD