［1］ 王宏刚, 裴昌幸, 陈南. 一种用于RFID能量有效的数据编码及其时钟提取［J］. 西安电子科技大学学报, 2007, 34 (6): 881-886.  Wang Honggang, Pei Changxing, Chen Nan. An Energy Efficient Data Coding Method and Timing Extraction for the RFID System［J］. Journal of Xidian University, 2007, 34 (6): 881-886. ［2］ ISO/IEC 18000-6. Radio Frequency for Item Management, Part 6: Parameters for Air Interface Communications at 860MHz to 960MHz［S］. Switzerland: ISO/IEC, 2006. ［3］ Cilek F, Seemann K, Brenk D, et al. Ultra Low Power Oscillator for UHF RFID Transponder ［C］//Frequency Control Symposium, 2008 IEEE International. New York: IEEE, 2008: 418-421. ［4］ Song F, Yin J, Liao H L, et al. Ultra Low Power Clock Generation Circuit for EPC Standard UHF RFID Transponders ［J］. Electronics Letters, 2008(44): 199-201. ［5］ EPCglobal Inc. Specification for RFID Air Interface EPCTM Radio-Frequency Identity Protocols Class-1 Generation-2 UHF RFID Conformance Requirements Version 1.0.2［S］. Boston: EPCglobal Inc, 2005. ［6］ Impinj Corporation. Gen 2 Tag Clock Rate — What You Need To Know［R/OL］. ［2010-07-15］. http://www.impinj.com/WorArea/downloadasset.aspx?id=2541. ［7］ 叶春晖, 冯勇建. 一种具有高输出精度及电源电压抑制能力的CMOS环形振荡器的设计［J］. 厦门大学学报, 2008(4): 519-522.  Ye Chunhui, Feng Yongjian. The Design of a CMOS Ring Oscillator with Superior Output Accuracy and Resistance to Power Supply Voltage［J］. Journal of Xiamen University,  2008(4): 519-522. ［8］ 许海峰, 王春锴, 邵丙铣. 适用于RFID芯片的CMOS振荡器［J］. 微电子学与计算机, 2008(4): 124-127.  Xu Haifeng, Wang Chunkai, Shao Bingxian. A CMOS Oscillator Used in RFID ［J］. Microelectronics ＆ Computer, 2008(4): 124-127. ［9］ Karthaus U, Schabel S. Pulse Generator for 16x DVD Recording with Symmetric CMOS Inverter Ring Oscillator ［J］. IEEE Solid-State Circuits, 2005, 40(11): 2286-2295. ［10］ 朱樟明, 杨银堂, 尹韬. 一种新型低压高精度CMOS电流源［J］. 西安电子科技大学学报, 2005, 32(2): 174-178.  Zhu Zhangming, Yang Yintang, Yin Tao. A Novel Low Voltage High Precision CMOS Current Reference［J］. Journal of Xidian University, 2005, 32(2): 174-178. ［11］ Hu Jianyun, He Yan, Min Hao. Design and Analysis of Analog Front-End of Passive RFID Transponders［J］. Chinese Journal of Semiconductors, 2006, 27(6): 999-1005. ［12］ 冯勇建, 胡洪平. 一种低功耗CMOS带隙基准电压源的实现［J］. 微电子学, 2007, 37(2): 231-237.  Feng Yongjian, Hu Hongping.  Implementation of a Low Power CMOS Bandgap Voltage Reference Source［J］. Microelectronics, 2007, 37(2): 231-237.