A demodulation method and device for non contact IC card load modulation data

A demodulation method and non-contact technology, applied in the direction of induction recording carrier, frequency modulation carrier system, instrument, etc., can solve the problems of unfavorable application and promotion of reading equipment, high cost, etc., and achieve good real-time performance, high resource allocation ratio, and high logic efficiency Effect

Active Publication Date: 2009-04-29
BEIJING TONGFANG MICROELECTRONICS
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the cost of this method is very high, which is not conducive to the application and promotion of reading equipment.

Method used

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  • A demodulation method and device for non contact IC card load modulation data
  • A demodulation method and device for non contact IC card load modulation data
  • A demodulation method and device for non contact IC card load modulation data

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Embodiment Construction

[0022] see figure 2 , the present invention comprises A / D converter 1, the IQ two-way mixing table 2 that is made up of I road mixing table 2-1 and Q road mixing table 2-2, by I road accumulator 3-1, Q road The accumulator 3-2 and the square adder 3-3 are composed of an IQ cumulative square adder 3 and a threshold decision unit 4. The analog signal is input by the A / D converter 1, and the threshold decision device 4 outputs demodulated data. A / D converter 1, IQ dual-way mixing table 2, IQ cumulative square adder 3 and threshold decision device 4 are sequentially connected in series and are all controlled by the main clock CLK. A / D converter 1 is realized by active filter or transistor shaping.

[0023] see image 3 , the steps of the inventive method are:

[0024] ①The analog data is input to the A / D converter 1.

[0025] ② The master clock CLK controls the A / D converter 1 and the NCO local oscillator.

[0026] ③ The output of the A / D converter 1 and the NCO local oscil...

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Abstract

A demodulation method and a device thereof for modulation data of non-contact IC card loads relate to the technical field of IC cards. The device of the invention comprises an A / D converter and a threshold decision device. A simulation signal is input by the A / D converter, and the threshold decision device outputs demodulation data. The structure is characterized in that the device also comprises an IQ two-way mixer consisting of an I-way mixer and a Q-way mixer and an IQ accumulative square adder consisting of an I-way accumulator, a Q-way accumulator and a square adder. The A / D converter, the IQ two-way mixer, the IQ accumulative square adder and the threshold decision device are connected in tandem and all controlled by a main clock CLK. Compared with the prior art, the invention has the advantages of high resource disposal ratio, high logic efficiency and good real-time performance.

Description

technical field [0001] The invention relates to the technical field of IC cards, in particular to a demodulation method for non-contact IC cards loaded with FSK modulation data conforming to the ISO 15693 protocol and the IS014443A protocol. Background technique [0002] The contactless IC card obtains the energy required for its own work by coupling the radio frequency field generated by the card reader, and at the same time receives the signal sent by the card reader, and then transmits data information to the card reader in the form of load modulation. The card reading device generally consists of a motherboard, a radio frequency card reader and an antenna. The RF card reader completes the analog amplification and digital demodulation of the load modulation data. [0003] The load modulation data returned by the non-contact IC card conforming to the IS0 15693 / 14443A protocol, the modulation mode of the data bit is single-frequency OOK modulation or dual-frequency FSK mod...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06K7/00H04L27/14H04L29/06
Inventor 孟庆云丁义民盛敬刚黄金煌徐磊
Owner BEIJING TONGFANG MICROELECTRONICS
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