超低功耗RFID标签基带处理器

Ultra Low Power Baseband Processor for RFID Tag

针对集成片上天线(OCA)的超高频射频识别(RFID)标签设计了一款RFID专用协议的基带处理器,以满足RFID标签嵌入纸张及微小物体的防伪功能。由于OCA与读写器天线近场耦合获取能量有限,集成OCA的无源标签对功耗要求更加苛刻。针对微小OCA标签的应用需求,采用异步电路、门控时钟、低压库、多时钟域等低功耗设计方法,设计了专用协议标签基带处理器,其CMOS低压库的设计可以使基带处理器在0.5 V的电源电压下工作,综合布局布线后,其电路仿真结果表明,峰值功耗仅为0.32μW。标签芯片在UMC 0.18μm标准工艺下流片,测试结果显示,在读写器输出20 d Bm能量的情况下,带OCA标签的读距离可达2 mm。

According to the radio frequency identification（ RFID） tag with on chip antenna（ OCA）,a baseband processor for a specific protocol RFID tag was designed to meet the anti-counterfeiting requirement for micro objects and thin paper. As the energy couple efficiency between the OCA and reader antenna was very low,the OCA tag performance was strict to the circuit＇s power consumption. A specific protocol baseband processor was implemented to satisfy the OCA tag application by using multiple low-power design methods,such as asynchronous circuits,clock gating,low voltage library and multiclock. An ultra-low voltage CMOS library established in the work was also used to decrease the supply voltage as low as 0. 5 V. The simulation result of the circuit show that the baseband processor power consumption is 0. 32 μW after comprehensive layout. The entire tag was fabricated in UMC 0. 18 μm standard process. Test results show that the OCA tag reading distance can be up to 2 mm on the condition that the reader transmission power is 20 d Bm.