This paper presents a low voltage, low power RF/analog front-end circuit for passive ultra high frequency （UHF） radio frequency identification （RFID） tags. Temperature compensation is achieved by a reference generator using sub-threshold techniques. The chip maintains a steady system clock in a temperature range from - 40 to 100℃. Some novel building blocks are developed to save system power consumption,including a zero static current power-on reset circuit and a voltage regulator. The RF/analog front-end circuit is implemented with digital base-band and EEPROM to construct a whole tag chip in 0. 18μm CMOS EEPROM technology without Schottcky diodes. Measured results show that the chip has a minimum supply voltage requirement of 0.75V. At this voltage, the total current consumption of the RF/analog frontend circuit is 4.6μA.
作为未来对于物体的识别技术,射频识别在人们生活中占有越来越重要的地位.这项技术将不断深入社会生活,在人们周围无处不在.由于这项技术的广泛应用,它的安全性以及涉及到个人生活的隐私问题不得不引起各界的关注.最初考虑到读卡器和标签之间通讯的可视性以及因特网络潜在的诸多攻击,研究者主要针对读卡器和后端数据库的通讯安全问题,做出了很多的工作.随着UHF标签的推行,读卡器和射频标签通讯范围增大,它们之间的通讯不再安全.本文针对读卡器和标签之间通讯中可能受到的攻击进行分析,建立了一个保证它们通讯安全的模型,依据该模型对EPC C lass1 G en2(EPC C 1G 2)协议进行分析,指出了协议可能受到的攻击,并提出了具有身份验证功能的协议修改方案.
