An active and passive dual-frequency chip and RFID system

Abstract

The invention discloses an active passive type double-frequency chip and an RFID system. The active passive type double-frequency chip comprises a passive awakening module and an active module, wherein the passive awakening module is used for receiving 125 K low-frequency activation signals, the active module is used for transmitting 2.4 G radio frequency signals, the passive awakening module comprises a first radio frequency antenna, a rectifying circuit, a demodulation circuit, a logic circuit and a power supply switch which are sequentially and electrically connected, the input end of the power supply switch receives awakening signals transmitted by the logic circuit and receives awakening feedback signals of the active module, the output end of the power supply switch is electrically connected with the awakening enabling end of a microprocessor circuit, and the output end of the microprocessor circuit is electrically connected with a second radio frequency antenna used for transmitting 2.4 G radio frequency signals. The active module is in the electricity-saving mode when the active passive type double-frequency chip is in the normal state, and therefore electricity is saved; when the 125 K low-frequency activation signals are received, the passive awakening module can awaken the active module, and the active module can transmit the 2.4 G radio frequency signals; thus, the active passive type double-frequency chip has the advantages of being large in data storage capacity, long in reading-writing distance and long in service life at the same time.

Description

technical field [0001] The invention relates to the technical field of dual-frequency radio frequency, in particular to an active and passive dual-frequency chip and an RFID system. Background technique [0002] Most of the RFID (Radio Frequency IDentification) tags currently on the market are active tags or passive tags with a single working frequency. Passive tags mainly include 125KHz, 13.56MHz, 915MHz, and three frequency band products. The main features are long life. Among them, 125KHz and 13.56MHz products have small storage capacity and short reading and writing distances, which cannot meet the requirements of long-distance reading and writing; although 915MHz products are in The reading and writing distance has been greatly improved, but the storage capacity is still very limited and cannot meet the needs of large-capacity storage. Active tags mainly include 2.4GHz products, which have large storage capacity and long reading and writing distances. However, due to t...

AI Technical Summary

Problems solved by technology

[0003] The first purpose of the present invention is to provide an active and passive dual-frequency chip. The active and passive dual-frequency chip has a large data storage capacity, a long reading and writing distance, and a long working life, which solves the problem of the short working life of the current single-frequency active tags. problems, and the shortcomings of passive tags with short reading and writing distances

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