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Self-calibration oscillator applied to non-contact smart IC (Integrated Circuit) card

A non-contact, self-calibration technology, which is applied in the direction of automatic power control, record carriers used by machines, instruments, etc., can solve the problems that are not desirable, do not meet the application requirements of non-contact IC cards, and the power consumption of ordinary phase-locked loops is large. and other issues to achieve the effect of meeting the power consumption

Inactive Publication Date: 2015-10-14
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It does not meet the application requirements of the non-contact IC card discussed in this article, and the power consumption of ordinary phase-locked loops is too large, and it is not advisable

Method used

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  • Self-calibration oscillator applied to non-contact smart IC (Integrated Circuit) card
  • Self-calibration oscillator applied to non-contact smart IC (Integrated Circuit) card
  • Self-calibration oscillator applied to non-contact smart IC (Integrated Circuit) card

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Experimental program
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Embodiment Construction

[0025] The present invention provides a new type of digital self-calibrating oscillator for non-contact smart card Type A, and samples the "pause" to ensure the correct demodulation of the digital part.

[0026] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described below with reference to the accompanying drawings and examples.

[0027] figure 2 It is a structural block diagram of a non-contact IC card analog front end and a data collection module.

[0028] The non-contact IC card is passive, and obtains energy from the carrier signal received by the antenna RF, and the rectification and voltage stabilization circuit obtains the DC voltage required for the operation of the non-contact IC card from the RF carrier signal received by the antenna RF, and the carrier The extraction circuit extracts the RF carrier clock RF_CLK from the RF carrier. Due to the 100% amplitude keying modulation...

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Abstract

The invention discloses a self-calibration oscillator applied to a non-contact IC (Integrated Circuit) card, and belongs to the technical field of IC card system clocks. The self-calibration oscillator is characterized by being used for providing a clock for a digital circuit and playing an important role in demodulating received signals and modulating transmitted signals. In the non-contact IC card, 100% amplitude shift keying modulation is adopted, and a 'pause' exists in an RF field, so that the smart card cannot acquire a clock from an antenna. One clock is generated to sample a demodulation waveform, a frequency deviation generated due to the change of a conventional oscillator along with the environment is reduced, and simulation bias current is adjusted through a digital algorithm, so that the self-calibration function of the oscillator is realized, and the correctness of digital part demodulation is ensured.

Description

technical field [0001] The invention relates to the realization of a data collection module of a non-contact IC card conforming to the ISO / IEC14443Type A protocol, especially aimed at sampling demodulated waveforms during pause intervals. Background technique [0002] Smart cards were produced in the French BULL company in the late 1970s. Afterwards, all countries began to develop and develop this technology, and applied this technology to many industries such as finance, transportation, medical care and identity certification. Combined with computer technology, it has improved the modernization of people's life and work. [0003] Divided according to the mode of external data transmission, there are contact IC card, non-contact IC card and dual-interface IC card. The contact mode follows the ISO / IEC7816 international standard; the non-contact mode follows the ISO / IEC14443 international standard. The IC card is non-contact, so it complies with the ISO / IEC14443 international...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03L7/00G06K19/07
Inventor 刘珊珊万培元李建军唐军林平分
Owner BEIJING UNIV OF TECH