Wireless clock calibration device for card reader and card reader
A technology for calibrating devices and wireless clocks, applied in the directions of collaborative devices, instruments, induction recording carriers, etc., can solve problems such as reducing calibration efficiency, and achieve the effect of improving the degree of automation, saving test costs, and improving clock calibration efficiency
Active Publication Date: 2022-03-11
SHANGHAI HUAHONG JITONG SMART SYST
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Problems solved by technology
[0004] The technical problem to be solved by the present invention is to overcome the defect that additional calibration pins are required for clock calibration of the card reader in the prior art, resulting in reduced calibration efficiency, and to provide a wireless clock calibration device and reader for the card reader. card reader
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[0026] The present invention is further illustrated below by means of examples, but the present invention is not limited to the scope of the examples.
[0027] like figure 1 As shown, the card reader provided in this embodiment includes an oscillator 2, a demodulation module 3, and a wireless clock calibration device for the card reader. The wireless clock calibration device includes an antenna 1, a processing module 4, and a frequency control module 5. Modulation module 3 comprises sampling unit 31, filtering unit 32, signal amplifying unit 33 and analog-to-digital conversion unit 34, and processing module 4 comprises 8 D flip-flops 41 ( figure 1 does not specifically show the number of D flip-flops 41) and the peak detection unit 42, but does not specifically limit the number of D flip-flops, which can be adjusted according to actual needs. In this embodiment, the oscillator 2 is set at the The main control chip of the card reader belongs to the on-chip designed oscillator,...
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The invention discloses a wireless clock calibration device for a card reader and the card reader. The wireless clock calibration device includes an antenna, a processing module and a frequency control module; the antenna is electrically connected to the demodulation module, and the processing module is respectively connected to the demodulation module and the frequency control module Electrically connected, the frequency control module is electrically connected to the oscillator, and the oscillator is electrically connected to the demodulation module; the antenna receives the reference clock signal and sends it to the demodulation module, the oscillator generates a clock signal, and sends it to the demodulation module, and the demodulation module Demodulate the received reference clock signal and clock signal respectively, and send them to the processing module respectively, and the processing module judges whether the absolute value of the difference between the frequency of the reference clock signal and the frequency of the clock signal is greater than or equal to the preset frequency difference, if , sending the frequency control signal to the frequency control module, and the frequency control module adjusts the frequency of the clock signal according to the frequency control signal. The invention improves the clock calibration efficiency and automation degree of the card reader.
Description
technical field [0001] The invention relates to the field of clock calibration, in particular to a wireless clock calibration device for a card reader and a card reader. Background technique [0002] According to the ISO14443 (Contactless card standards (non-contact IC card standard) protocol) international standard, the high-frequency card reader should read and write the card within the frequency range of 13.56MHz±7kHz. At present, there are two ways to generate the clock signal of the main control chip of the card reader. The first is to use an off-chip (that is, outside the main control chip) crystal oscillator, and the second is to design an oscillation on-chip (that is, inside the main control chip). device. Generally speaking, designing an oscillator on-chip is beneficial to increase integration and reduce cost, but the accuracy of the oscillation frequency is prone to deviation due to the influence of the process, so the clock of the product must be calibrated befor...
Claims
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IPC IPC(8): G06K17/00G06K7/016
CPCG06K7/0166G06K17/0029
Inventor 丁毅岭李国宏
Owner SHANGHAI HUAHONG JITONG SMART SYST