Research And Design Of RFID Analog Circuits For The Standard ISO/IEC 15693

Radio Frequency Identification(RFID) is a contacless communication technology which can take information bidirectional communication for indentification through electronmagnetic induction.The peformance and price of RFID chip is the key factor that determined popularization and application of RFID technology.Therefore independently design a hign performance-price ratio RFID tag chip with independent intellectual property right have a very important significance to promote the use of RFID system products.The physical performance and standard of RFID tag chip are determinded by its analog circuits, the task of this paper is to design a high-performance analog circuits of RFID tag chip that meets the standard ISO/IEC 15693.Based on the basic operation principle of RFID sysytem and standard ISO/IEC 15693,this paper proposed the whole structure of tag chip analog circuits and designed each module circuits in detail,these circuits include power acquisition circuit,clock extraction and division circuit, modulation and demodulation circuit,power-on and power-down reset circuit,charge pump circuit and so on.The designed circuits are simulated with CSMC 0.6um CMOS device model,the results show that the circuits can work well and conform to standard ISO/IEC 15693.The innovations in this paper are that: 1.Designed a new type of rectifier circuit,eliminated the threshold voltage drop,rasing the output voltage; 2.In rectifier circuit,applying the MOS transistor switching characteristics,suppressed the flowing back of charge in storage capacitor,raising the power conversion efficiency;3.The adoption of the demodulation output of 100% ASK and 10% ASK modulated signal,the power-on and power-down reset signal incorporated to one signal,simplified the structure of circuits and follow-up processing circuits,saved chip area.