【作者】 熊廷文；

【导师】 张科峰；

【作者基本信息】 华中科技大学 ， 微电子学与固体电子学， 2007， 硕士

【摘要】 近年来,射频识别技术(RFID,Radio Frequency Identification)已经广泛地用于物流管理、交通管理、门禁系统、生产自动化等众多领域。一个基本的射频识别系统包括读写器(Reader)和电子标签(Tag)两部分。模拟前端是射频识别芯片中的关键模块,包括读写器模拟前端和标签模拟前端两个部分。针对读写器芯片模拟前端接收电路的解调精度不够的问题,本文给出了一种基于采样接收的正交解调电路,包括载波解调电路、自动增益放大器、相关器以及量化与估算模块等;调制发射包括100%ASK调制和10%ASK调制两种,采用多路直接调制发射电路,满足不同发射功率的需要。RFID电子标签根据其能量来源可以分为无源和有源两种。无源RFID电子标签通过自身的标签天线感应出Reader发射的射频信号来产生整个芯片工作的电源。因此,如何高效地利用感应到的能量给芯片供电成为无源RFID标签芯片模拟前端的最重要的问题。本文给出了一种适用于无源高频RFID标签芯片的LDO线性稳压器电路的设计。该稳压器具有较宽的输入电压范围(3.3V～7.5V)、较低的输入输出压差(120mV)和静态电流(<20μA),能高效地利用标签天线上感应到的能量产生整个芯片的工作电源。此外,本文给出了一种标签芯片调制解调电路的设计,该电路能同时符合目前高频RFID系统的三种国际标准。最后本文进行了射频识别系统模拟前端的仿真建模,并给出了验证方案和系统仿真结果。电路设计和仿真采用中芯国际0.35μm工艺库,并通过该公司的流片验证。仿真结果表明所设计的模拟前端完全满足高频RFID系统的工作要求。更多还原

【Abstract】 In recent years, broad applications of Radio Frequency Identification(RFID) have been found in areas of supplychain management, access contrl, public transportation, automatic manufacturing, etc. RFID system consists of two major components, an interrogator (reader) and a transponder (tag). RF front end transceiver is one of the most important parts in RFID system, including interrogator transceiver and transponder transceiver.A subsampling based quadrature demodulator is described, including carrier demodulation block, automatic gain amplifier(AGC), correlation block , evaluation and digitizer block, to improve the performance. Multi-Direct-Conversion transmitters are designed to meet the requirements of different power transmission, including 100% ASK modulation and 10% ASK modulation .RFID tags are often classified as passive ones and actives ones, according to the origin of power. The passive tag is energized by inducing the electromagnetic radio frequency wave transmitted by the reader. How to make full use of the power is one of the key problems. A design of LDO voltage regulator for high frequency RFID tag IC is presented. Simulation results show that the typical dropout is 120mV and the typical quiescent current is 20μA, and the regulator can be operable at input voltages 3.3V-7.5V. Furthermore, the modulation and demodulation circuits of the tag have been demonstrated, which fulfil the requirements of three kinds of present international standards.Finally, Simulation models and verification method have been brought forth. The design has been implemented with 0.35um CMOS technology by SMIC. The simulation results verify the feasibility of the design.更多还原