1852aa3d-5ed4-46e3-ac64-7a0e8418276220250326051611029wseas:wseasmdt@crossref.orgMDT DepositWSEAS TRANSACTIONS ON CIRCUITS AND SYSTEMS2224-266X1109-273410.37394/23201http://wseas.org/wseas/cms.action?id=2861214202521420252410.37394/23201.2025.24https://wseas.com/journals/cas/2025.phpSmailHassouniLISAC Laboratory, Faculty of Sciences Dhar El Mahraz, Sidi Mohamed Ben Abdellah University, BP 1796 Fes-Atlas, 30003, Fez, MOROCCOHassanQjidaaLISAC Laboratory, Faculty of Sciences Dhar El Mahraz, Sidi Mohamed Ben Abdellah University, BP 1796 Fes-Atlas, 30003, Fez, MOROCCOThis paper presents the design of a regulated voltage supply circuit for a passive UHF RFID tag, which contains a matching network for maximum power delivery, a rectifier, and a voltage regulator. The proposed rectifier overcomes the limitations of conventional rectifiers by achieving both high power conversion efficiency and high output voltage. The circuit achieves 38% power conversion efficiency at 920 MHz, -21 dBm input power, and 1M DC output load. The -21 dBm threshold power improves efficiency and reduces total power consumption, which extends the communication range. The short operating distance of RFID technology has limited its application range in other fields. The theoretical equations and design techniques of the proposed regulated voltage supply circuit are presented and validated with simulation results in a 90 nm CMOS process.3262025326202559657https://wseas.com/journals/cas/2025/a145101-006(2025).pdf10.37394/23201.2025.24.7https://wseas.com/journals/cas/2025/a145101-006(2025).pdf10.1109/esscir.2005.1541614Cho N, Song S-J, Kim S, Yoo H-J. A 5.1µW 0.3 mm2 UHF RFID tag chip integrated with sensors for wireless environmental monitoring. Proceeding of European Solidstate Circuits Conference, Grenoble, France, 2005; 279–282. 10.1109/asscc.2008.4708740Sasaki, Atsushi, Kotani, Koji, et Ito, Takashi. Differential-drive CMOS rectifier for UHF RFIDs with 66% PCE at− 12 dBm input. 2008 IEEE Asian Solid-State Circuits Conference. IEEE, 2008. p.105-108. 10.1017/s1759078714000841Hassouni.S & Qjidaa.H. A design of analog VDD generator for passive UHF RFID Tag in 90 nm CMOS. International Journal of Microwave and Wireless Technologies. Vol. 7, Issue 5, October 2015, pp. 507 - 513. https://doi.org/10.1017/S1759078714000841. 10.1109/tcsi.2006.887974YI, Jun, KI, Wing-Hung, et TSUI, Chi-Ying. Analysis and design strategy of UHF micropower CMOS rectifiers for micro-sensor and RFID applications. IEEE Transactions on Circuits and Systems I: Regular Papers, 2007, vol. 54, no 1, p. 153-166. ZHU, Zheng, JAMALI, Ben, et COLE, P. Brief comparison of different rectifier structures for HF and UHF RFID. The Adelade Auto-ID Lab, The University of Adelaide, 2004. 10.1109/tcsi.2007.902615Milliken R.J., Silva-Martinez J., SanchezSinencio E., Full On-Chip CMOS LowDropout Voltage Regulator. IEEE Transactions on Circuits and Systems I: Regular Papers, vol.54, no.9, pp.1879, 1890, Sept. 2007. 10.1109/jssc.2003.817249Udo Karthaus and Martin Fischer, “Fully integrated passive UHF RFID transponder IC with 16.7- μW minimum RF input power”, IEEE Journal of Solid-state Circuits, Vol. 38, No.10, October 2003, pp.1602-1608. 10.1017/s1759078714000841Hassouni S, Qjidaa H. A design of analog VDD generator for passive UHF RFID Tag in 90 nm CMOS. International Journal of Microwave and Wireless Technologies. 2015;7(5):507-513. doi: 10.1017/S1759078714000841. 10.1002/cta.726Guo, Jianping, and Ka Nang Leung. A CMOS voltage regulator for passive RFID tag ICs. International Journal of Circuit Theory and Applications, 2012, vol. 40, no 4, p. 329-340. 10.1109/4.760378H. Banba, H. Shiga, A. Umezawa, T. Miyaba, T. Tanzawa, S. Atsumi, and K. Sakui, “A CMOS bandgap reference circuit with sub-1- V operation,” IEEE Journal of Solid- State Circuits, vol. 34, no.5, pp. 670 - 674, May. 1999.