Chip for signal amplifier of radio frequency recognition system and signal amplifier thereof

Abstract

The invention discloses a chip of a signal enhancer used for a RF identifying system; the chip of the signal enhancer includes a receiving circuit, a transmitting circuit and a power module; the receiving circuit includes a filter, a demodulation amplifying module and a digital quantification module. The transmitting circuit includes a logic control module and a demodulation module. The signal transmitted to the signal enhancer by a double interface SIM card is received by the input end of the filter; the output end of the filter is connected with the input end of the demodulation amplifying module and then is output to the input end of the digital quantification module and then is output to the input end of the logic control module. The logic control module outputs the signal to the input end of the demodulation module. The demodulation module generates a subcarrier which reflects and demodulates the signal and returns the signals to a reader. The signal enhancer effectively solves the problem of signal attenuation by utilizing each module inside the chip of the signal enhancer and realizes the non-contact close-distance RF identification on a mobile phone under the situations of not changing the movable communication terminals like the existing RFID reader and the mobile phones.

Description

technical field [0001] The invention relates to a radio frequency identification technology, in particular to a signal booster chip and a signal booster for a radio frequency identification system. Background technique [0002] After more than ten years of development, radio frequency identification technology (Radio Frequency Identification, hereinafter referred to as RFID) technology, including contactless integrated circuit card (Integrated Circuit Card, referred to as IC card), has penetrated into every corner of modern life and is widely used in Public transportation, access control, small electronic payment and other fields. Radio frequency identification technology is a kind of automatic identification technology. The composition of radio frequency identification system generally includes at least two parts: (1) electronic tag, the English name is Tag; (2) reader, the English name is Reader. Electronic data in an agreed format is generally stored in the electronic ta...

AI Technical Summary

Problems solved by technology

But the disadvantages of these two solutions are: the antenna is pasted on the surface of the SIM card or drawn out to the front or back of the mobile phone, which will easily cause the antenna to break and damage during the installation process, and cause inconvenience to the user. Shielding effect, the dual-interface SIM card can receive the signal from the reader and the signal reflected to the reader is very weak, if the signal returned by the dual-interface SIM card is not amplified and the reader matched with the dual-interface SIM card Without a signal booster, the communication quality between the dual-interface SIM card and the reader will be very poor, and the reader will hardly receive the response from the dual-interface SIM card

[0013] Due to the shielding effect of the mobile phone battery and the circuit board, if the dual-interface IC card replaces the existing SIM card and is applied to the mobile phone environment, the dual-interface IC card will not be able to reliably receive the command signal sent by the reader. After passing through the mobile phone environment, it will be greatly attenuated, and such a small response signal cannot be received and distinguished by the reader

In view of this situation, it is impossible to directly apply the dual-interface IC card to the dual-interface SIM card in the mobile phone

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