Research On Key Technologies Of High-security Electronic Tag Chip Based On ISO/IEC 15693 Protocol

Radio Frequency Identification(RFID)technology is a technology that realizes contactless identification by coupling radio frequency signals with each other.With the rapid development of Internet of Things(IoT)technology,RFID electronic tags have been widely used in various fields due to their low cost,large storage capacity and long identification distance.Starting from the problem that the existing RFID electronic tag commodity anti-counterfeiting technology cannot effectively prevent the information of the tag chip from being copied or the tag from being recycled for forgery,this paper conducts relevant research on the key technologies of the high-frequency electronic tag chip.Firstly,this paper analyzes the research status of high-frequency electronic tag chip and high-security electronic tag technology.On the basis of studying the energy and data transmission principle of high-frequency RFID system and combining the relevant contents of ISO/IEC 15693 protocol,an electronic tag chip architecture that can be used in the anti-counterfeiting field is proposed.Then,the key circuits of the analog front-end of the tag chip are studied.Based on the stable temperature characteristics of the on-chip resistor and MOS transistor threshold voltage under process variation,a new reference current source structure is proposed,and the reference current with good temperature characteristics under different process corners is obtained.After studying the hardware anti-counterfeiting technology of the tag chip,a hardware anti-counterfeiting circuit based on pin interconnection information state detection is designed,and a tag chip anti-counterfeiting verification mechanism using the circuit is proposed.According to the research into the low power latch comparator technology,the regeneration stage module of the comparator circuit is optimally designed,which improves the speed of the comparator and reduces the power consumption of the circuit.The design,simulation and optimization of rectifying and limiting circuit,demodulation circuit,power-on reset circuit,clock circuit and voltage stabilizing circuit in the analog front end are completed.Meanwhile,the simulation results and layout design of some modules are also given.Secondly,on the basis of in-depth analysis of the protocol,the digital baseband circuit architecture of the tag chip is designed,and the design ideas and implementation methods of synchronization,decoding,main state machine,encoding and other modules are given.The encryption module is introduced into the digital baseband circuit to enhance the security of data communication of the tag chip,and a method to verify the authenticity of the tag by using encryption and decryption variables is proposed.Finally,the layout design and post-simulation analysis of the analog front-end of the tag chip are completed by using 0.18?m CMOS technology.At the same time,the FPGA prototype verification of the digital baseband circuit is carried out.The post-simulation and verification results show that the functions of each module meet the design requirements.To sum up,by adopting the modular design idea and top-down design method,and using theoretical analysis,simulation and test verification,the design of high-security electronic tag chip which is based on ISO/IEC 15693 protocol is completed.