DocumentCode :
552323
Title :
Improved efficiency in the CMOS cross-connected bridge rectifier for RFID applications
Author :
Rabén, Hans ; Borg, Johan ; Johansson, Jonny
Author_Institution :
Dept. of Comput. Sci. & Electr. Eng., Lulea Univ. of Technol., Lulea, Sweden
fYear :
2011
fDate :
16-18 June 2011
Firstpage :
334
Lastpage :
339
Abstract :
A bridge rectifier based on the cross-connected NMOS-PMOS bridge that avoids the inherent degradation of power conversion efficiency for increasing input levels is presented. Instead of PMOS switches, the proposed rectifier uses diode-connected MOS transistors with static threshold cancellation and minimised diode reverse leakage. With a simple and power efficient circuit solution the new rectifier allows for low-power, passive tag implementation in standard CMOS for both LF and HF RFID applications. Simulation results of the proposed rectifier in a 0.35 μm CMOS process show a power conversion efficiency over 60% for all input levels above 0.75 V with a 100 kΩ load and an input signal frequency of 13.56 MHz. The simulated DC output voltage at the same conditions is approximately Vin-0.3 V. A model for the PCE of the new rectifier that includes the impact of the Vth-generator is developed and compared with simulated results.
Keywords :
CMOS integrated circuits; bridge circuits; radiofrequency identification; rectifiers; CMOS cross-connected bridge rectifier; DC output voltage; HF RFID applications; LF RFID applications; PCE; Vth-generator; cross-connected NMOS-PMOS bridge; diode-connected MOS transistors; frequency 13.56 MHz; passive tag implementation; power efficient circuit solution; resistance 100 kohm; size 0.35 mum; static threshold cancellation; voltage 0.75 V; Bridge circuits; Inverters; Logic gates; MOSFETs; Power conversion; Radiofrequency identification; Schottky diodes; CMOS; RFID; active diode; analog integrated circuits; low power; low voltage; power conversion efficiency; rectifier; reverse leakage; threshold elimination;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Mixed Design of Integrated Circuits and Systems (MIXDES), 2011 Proceedings of the 18th International Conference
Conference_Location :
Gliwice
Print_ISBN :
978-1-4577-0304-1
Type :
conf
Filename :
6015936
Link To Document :
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