An ultra-low power passive UHF RFID transponder with self-calibrated clock generator

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 0.18µm mixed-signal CMOS process with a die size of 0.75mm×0.75mm. Measurement results show that the proposed RFID transponder operates with a sensitivity of −10dBm.

[1]  Huailin Liao,et al.  Ultra-low-power clock generation circuit for EPC standard UHF RDID transponders , 2008 .

[2]  Anne-Johan Annema,et al.  Low-power bandgap references featuring DTMOSTs , 1998 .

[3]  Edward K. F. Lee,et al.  A 1.2 V bandgap reference based on transimpedance amplifier , 2000, 2000 IEEE International Symposium on Circuits and Systems. Emerging Technologies for the 21st Century. Proceedings (IEEE Cat No.00CH36353).

[4]  H. Yoshida,et al.  A 950-MHz rectifier circuit for sensor network tags with 10-m distance , 2006, IEEE Journal of Solid-State Circuits.

[5]  Chi-Ying Tsui,et al.  Design and Implementation of a Low-power Baseband-system for RFID Tag , 2007, 2007 IEEE International Symposium on Circuits and Systems.

[6]  Zhihua Wang,et al.  A low-power RF front-end of passive UHF RFID transponders , 2008, APCCAS 2008 - 2008 IEEE Asia Pacific Conference on Circuits and Systems.

[7]  A.-J. Annema,et al.  Low-power bandgap references featuring DTMOSTs , 1999, Proceedings of the 24th European Solid-State Circuits Conference.

[8]  Ming-Dou Ker,et al.  New Curvature-Compensation Technique for CMOS Bandgap Reference With Sub-1-V Operation , 2006, IEEE Transactions on Circuits and Systems II: Express Briefs.

[9]  K. Leung,et al.  A sub-1-V 15-ppm/°C CMOS bandgap voltage reference without requiring low threshold voltage device , 2002, IEEE J. Solid State Circuits.

[10]  He Yan,et al.  A novel baseband-processor for LF RFID tag , 2007, 2007 7th International Conference on ASIC.

[11]  Ilaria De Munari,et al.  Improved Pervasive Sensing With RFID: An Ultra-Low Power Baseband Processor for UHF Tags , 2009, IEEE Transactions on Very Large Scale Integration (VLSI) Systems.

[12]  G. Iannaccone,et al.  Design criteria for the RF section of UHF and microwave passive RFID transponders , 2005, IEEE Transactions on Microwave Theory and Techniques.

[13]  I. Velez,et al.  Power and energy optimization of the digital core of a Gen2 long range full passive RFID sensor tag , 2008, 2008 IEEE International Conference on RFID.

[14]  H.C. Luong,et al.  A 7-μW clock generator in 0.18-μm CMOS for passive UHF RFID EPC G2 tags , 2007, ESSCIRC 2007 - 33rd European Solid-State Circuits Conference.