Design And Implementation Of Multi-rate Baseband For Passive UHF RFID

Passive UHF Radio frequency identification (RFID) technology has become a focus in many countries for its long operation range and high identification rate. Some protocols have been proposed by America and European countries, many top silicon companies pay much attention to research and development in UHF RFID chip and solution. This technology will become more and more popular in the future.UHF RFID Tag is the data carrier for this communication system, its function is energy collection, protocol parsing, memory access control and so on. Scale, power consume, protocol implementation are the key technology of UHF RFID Tag design. Based on ISO/IEC18000-6C protocol, this thesis focus on tag-to-interrogator communications, and difficulty in baseband design, the difficulty is multiply BLF(Backscatter Link Frequency), tags shall support all the link frequency from40KHz to640KHz specified by protocol.With the deeply analyze of protocol and research of baseband function, a method based on Interval is presented to resolve the multi-rate communication, a communication rate control module is added without changes of existed structure. This method makes the baseband not sensitive to the system clock deviation. Design uses Synopsys Design Compiler for logic synthesis and Synopsys Astro for physical implementation, the chip has taped out using TSMC0.18um process.According to the tag test results, frequency division based on interval can resolve the multi-rate communication (BLF) problem successfully, and baseband is not sensitive to the system clock deviation.