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A Digital Baseband with Novel Clock Generator for UHF RFID Tag

Ying Cao, Shan-Shan Yong, Xin-An Wang, Fang-Ni Zhang, and Ji-Ting Su
The Key Lab of Integrated Microsystems, Peking University Shenzhen Graduate School, Shenzhen, China
Abstract—Clock accuracy is critical to the performance of UHF (Ultra High Frequency) RFID (Radio Frequency Identification) tag, especially for the encoder in baseband. To reduce the bit error rate of the responded data from tag, a novel clock strategy is proposed in this paper, which generates a high accuracy clock for the encoder bycounting the preamble of the commands from reader. Moreover, for reducing the chip area and thepower consumption, a novel CRC (Cyclic Redundancy Check) generator is designed, which reuses the resource and fulfills a no-gap-link between the responded data and CRC code. The baseband of tag is implemented in a 0.18µm CMOS process and its area is 75479µm2.Simulation results show that the frequency variation of the clock is within a reasonable range. 
 
Index Terms—UHF RFID Tag, clock generator,CRC, accuracy, error-rate, encoder

Cite: Ying Cao, Shan-Shan Yong, Xin-An Wang, Fang-Ni Zhang, and Ji-Ting Su, "A Digital Baseband with Novel Clock Generator for UHF RFID Tag," International Journal of Electronics and Electrical Engineering, Vol. 1, No. 3, pp. 155-159, September 2013. doi: 10.12720/ijeee.1.3.155-159
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