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A fully integrated, 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 baseband processor, an ultra-low power, self-calibrated clock generator is presented. Further, a low temperature-coefficient, power-efficient voltage reference is introduced. And several practical strategies are employed to further reduce power consumption of the baseband processor. The chip was fabricated in 0.18Â¿m mixed-signal CMOS process with a die size of 0.75mmÃ0.75mm. Measurement results show that the proposed RFID transponder operates with a sensitivity of -10dBm.