2.45 GHz RFID半有源标签电源管理电路设计  

A Novel Power Management Circuit for Semi-Passive Tag in 2.45 GHz RFID

作　　者：王潇潇[1] 张世林[1] 张艳征[1] 毛陆虹[1] 谢生[1] 

机构地区：[1]天津大学电子信息工程学院,天津300072

出　　处：《微电子学》2013年第5期661-666,共6页Microelectronics

基　　金：国家自然科学基金资助项目(61072010)

摘　　要：针对半有源标签的特点,分析了制约半有源标签读写距离与使用寿命的因素,提出一种适用于2.45GHz射频识别的带模式控制功能的电源管理电路设计方案,以使标签的识别距离最大化,延长标签的使用寿命。该方案中,标签可根据与读写器的距离自动切换有源/无源工作模式,供电电源也随之在内部电池和射频信号之间自动切换。在无源模式下,所有高功耗模块,如低噪声放大器、调制器和功率放大器将被关断,以最大程度地节省整体芯片功耗;在有源模式下,高功耗模块启动,标签的工作距离大大提高。仿真结果表明,在输入电压为500mV,负载电阻为60kΩ的情况下,电荷泵的输出可达1.9V,为其他模块正常工作提供了可靠保证。Factors affecting read/write distance and life time of semi-passive tags were analyzed, and a novel power management circuit with mode control function for semi-active 2. 45 GHz RFID tag was proposed. The tag could automatically switch between passive and active modes depending on its distance to the reader. When the RF- power generated was sufficient for operation, the tag worked in passive mode, in which high power devices were turned off to save power, otherwise, it operated in semi-active mode using battery power. Simulation results showed that a minimum input level of 275 mV was required to generate 1.9 V supply voltage for 60 kΩ load.

关 键 词：RFID 半有源标签 模式控制 电源管理 

分 类 号：TN433[电子电信—微电子学与固体电子学]