Journal
IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS I-REGULAR PAPERS
Volume 66, Issue 9, Pages 3288-3295Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TCSI.2019.2927397
Keywords
Batteryless; charge pump; photovoltaic energy harvesting
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Funding
- Ministry of Science and Technology (MOST), Taiwan [107-2221-E-009-127-MY3, 105-2628-E-009-007-MY3, 107-2622-8-009-009-TA, 108-2636-E-009-008, 108-2636-E-009-009]
- Novel Bioengineering and Technological Approaches to Solve Two Major Health Problems in Taiwan - Taiwan Ministry of Science and Technology Academic Excellence Program [MOST 108-2633-B-009-001]
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This paper presents an optically-powered wireless tag, integrating a charge pump (CP) and a low-power RF transmitter for batteryless Internet-of-Things (IoT) applications. The proposed charge pump with hysteresis regulation mechanism (HRM) powers the transmitter circuit using indoor light energy. The charge pump enables the transmitter whenever the output capacitor stores sufficient energy and guarantees a short period signal transmission. The proposed low-power transmitter contains the subharmonically injection-locked PLL and the capacitive coupling technique to achieve a large frequency multiplication ratio. The proposed batteryless wireless chip is fabricated in 0.18-mu m CMOS process. The measurement results demonstrate that the proposed charge pump provides a 1.1 to 1.3 V hysteresis regulated voltage under indoor light illumination larger than 300 lux. The charge pump achieves 84.1% peak efficiency and the communication distance of 3 meters is demonstrated while only consuming 248 mu W.
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