A Transponder Chip for Wireless Identification System

• Main Authors: Liu, Zen-Yih, 劉增毅
• Other Authors: Sau-Mou Wu
• Format: Others
• Language: zh-TW
• Online Access: http://ndltd.ncl.edu.tw/handle/84093106585788588672

碩士 === 元智工學院 === 電機與資訊工程研究所 === 84 === A novel batteryless, self-powered transponder design as well as its chiplayout is presented. The transponder operates in two phase. First,the chipgets energized by rectifying the electromagnetic energy from the interrogationRF field from the RFID base station; the extracted energy is temporarily storedand is thereafter used to power the whole circuitry. Second, the transponder starts to transmit coded data by FSK modulation back to the base station. The major part of the design is implemented by the digital CMOS circuit technology,thus simple and easy to implement. The circuit is designed such that the outputfrequencies are independent of the load of the antenna; the simulation resultsshow that the tolerance of the antenna variation is at least up to 10%. The design is compatible with TIRIS system, which is a popular RFID product by theTexas Instruments. It operates in the 134.2kHz and 123.2kHz frequency bands. The layout occupies about 0.8mm x 0.8mm area.