Acta Scientiarum Naturalium Universitatis Pekinensis

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A Passive UHF RFID Transponder with Novel Clock Generator

FENG Xiaoxing, WANG Xin’an, ZHANG Xing, GE Binjie   

  1. The Key Laboratory of Integrated Microsystems, Shenzhen Graduate School, Peking University, Shenzhen 518055;
  • Received:2010-02-25 Online:2011-05-20 Published:2011-05-20

一种具有新型时钟产生器的无源超高频 RFID 标签

冯晓星, 王新安, 张兴, 葛彬杰   

  1. 北京大学深圳研究生院集成微系统科学工程与应用重点实验室, 深圳518055;

Abstract: An ultra-low power passive UHF RFID transponder complying with ISO/IEC 18000-6B protocol is presented. In order to provide an accurate clock for the digital baseband processing, an ultra-low power and self-calibrated clock generator is designed and implemented in the transponder with a clock variation within 4% against temperature from -50℃ to 120 ℃ or supply voltage from 0.7 to 1.6 V. Total power consumption of the novel clock generator is only 364 nW with 0.7V supply voltage. Further, a low voltage bandgap reference which generates 0.96 V with 100 nA current consumption is introduced. In digital baseband, clock gating and module reuse strategies are employed to further reduce the power consumption to 1.17 μW. This design is fabricated in 0.18 μm mix-signal CMOS process with a die size of 0.75 mm×0.75 mm. Measurement results show that the proposed RFID transponder operates with a sensitivity of -10 dBm.

Key words: ultra-low power, self-calibrated, clock gating, power management

摘要: 给出一种符合 ISO/IEC 18000-6B 协议的超低功耗的无源超高频 RFID 标签。为了能够给标签数字基带处理提供准确的时钟, 使用了一种超低功耗、自校正的时钟产生器, 产生的时钟在-50℃~120 ℃或者 0.7~1.6 V 电源电压的范围内, 偏差小于 4%。此自校正时钟模块的功耗在 0.7 V 的电源电压下仅为 364 nW。一个低压输出参考电压源也集成到了该标签芯片中, 该模块产生 0.96 V 的基准且只消耗 100 nA 的电流。采用门控时钟和模块复用使功耗降低至 1.17 μW。该设计采用 0.18μm 的混合信号 CMOS 工艺, 整个面积为 0.75mm ×0.75mm 。测试结果显示该标签的灵敏度达到-10 dBm。

关键词: 超低功耗, 自校正, 门控时钟, 功率管理

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