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设计完成了一款无源超高频RFID标签的低功耗模拟前端电路。采用了一种新的阈值消除技术,整流电路的能量转换效率可以达到30%以上;使用一种低功耗的稳压电路,为数字电路提供稳定的1 V电源电压的同时功耗为500 nA。此外提出了一种等效灵敏度的测试方法,可以简便地获得标签芯片的激活功率水平。该设计采用TSMC 0.18μm工艺,整个芯片面积为700μm×800μm。测试结果显示:稳压电路可以输出稳定的0.95 V电压,解调模块可以正确调解幅度大于150 mV的天线信号。根据等效灵敏度测试方法,测得本设计的灵敏度约为-14.9 dBm。
Design completed a passive UHF RFID tags low-power analog front-end circuit. Incorporating a new threshold cancellation technique, the energy conversion efficiency of the rectification circuit can reach more than 30%. Using a low-power regulator circuit that provides a stable 1 V supply voltage for digital circuits while consuming 500 nA . In addition, a test method of equivalent sensitivity is proposed, which can easily obtain the activation power level of the tag chip. The design uses TSMC 0.18μm process, the entire chip area of 700μm × 800μm. Test results show that: the regulator circuit can output a stable 0.95 V voltage, the demodulator module can correctly adjust the antenna signal amplitude greater than 150 mV. According to the equivalent sensitivity test method, the sensitivity of this design is about -14.9 dBm.