Title :
A self-sustaining integrated CMOS regulator for solar and UHF RFID energy harvesting systems
Author :
Tsung-Heng Tsai ; Bo-Han Song
Author_Institution :
Dept. of Electr. Eng., Nat. Chung Cheng Univ., Chiayi, Taiwan
Abstract :
A self-sustaining regulator harvesting from two energy sources, solar and radio-frequency energy, is designed. A charge pump utilizing charge transfer switch (CTS) with tunable voltages at the bottom of the pumping capacitors is proposed. Through a DC-DC switching converter with a digital pulse-width modulator, the output voltage is regulated at 1V. In the digital DC-DC switching converter, we propose to analyze the error signal by an oversampling analog-to-digital converter (ADC). The system is completely implemented and fully-integrated in a standard 0.18μm CMOS process, and the achieved maximum end-to-end conversion efficiency is about 62%.
Keywords :
CMOS integrated circuits; DC-DC power convertors; UHF devices; UHF integrated circuits; charge pump circuits; energy harvesting; radiofrequency identification; solar power; voltage regulators; CTS; UHF RFID energy harvesting systems; charge pump; charge transfer switch; digital DC-DC switching converter; digital pulse-width modulator; efficiency 62 percent; oversampling ADC; oversampling analog-to-digital converter; pumping capacitors; self-sustaining integrated CMOS regulator; size 0.18 mum; solar energy harvesting systems; tunable voltages; voltage 1 V; Charge pumps; Energy harvesting; Modulation; Radiofrequency identification; Switches; Switching converters;
Conference_Titel :
Circuits and Systems (ISCAS), 2013 IEEE International Symposium on
Conference_Location :
Beijing
Print_ISBN :
978-1-4673-5760-9
DOI :
10.1109/ISCAS.2013.6571773
