Power-failure transient memory used for passive radio-frequency identification labeled chip

Abstract

The invention discloses a power-failure transient memory used for a passive radio-frequency identification labeled chip, and relates to memory technology in the field of circuits. The power-failure transient memory is supplied with power by a power supply voltage VDD and comprises a reference current source, a control unit, a bias voltage generating circuit, a storage unit and a judgment logic, wherein the reference current source supplies bias current for the storage unit and the judgment logic; the control unit generates a control signal according to a reset signal RESET provided by a digital circuit and information STM-IN to be stored to operate the storage unit; the bias voltage generating circuit converts reference current generated by the reference current source into reference voltage as a reference signal of the judgment logic; the storage unit carries out transient storage on the information to be stored according to the instruction of the control unit; and the judgment logic compares the relation of the storage content of the storage unit and the reference voltage, converts an analog signal into a digital signal STM-OUT and outputs the digital signal into the digital circuit. The power-failure transient memory can store state information of the labeled chip before power failure or a middle state of the digital circuit for short time, and improve the efficiency and stability of short-distance wireless communication.

Description

technical field [0001] The invention relates to memory technology in the circuit field, in particular to a power-off transient memory used for radio frequency identification (RFID) electronic tags and other chips. Background technique [0002] With the rapid development of integrated circuit design technology, RFID technology is being widely used in various fields of production and life such as industrial automation, commercial automation, and transportation control management. A typical RFID system is divided into three parts: reader, RFID tag and information processing terminal. The reader is used to read and write the tag, and the tag is the carrier for storing the information of the identified individual in the RFID system. [0003] For passive RFID tags, the power supply of the chip is generally obtained by the electromagnetic field generated by the chip antenna induction reader. Due to some non-ideal factors such as the environment, during the reading process of the ...

AI Technical Summary

Problems solved by technology

The information stored in the volatile memory in the prior art will be lost immediately after power failure, and the information stored in the non-volatile memory will be retained for a long time after power failure, which cannot meet the requirements of the RFID communication protocol for state storage

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