关键词: 超低功耗, 自校正, 门控时钟, 功率管理

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