A Single-Chip Solar Energy Harvesting IC using Integrated Photodiodes with a 67% Charge Pump Maximum Efficiency

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	A Single-Chip Solar Energy Harvesting IC using Integrated Photodiodes with a 67% Charge Pump Maximum Efficiency
	Chen, Z.; Law, M. K.; Mak, P. I.; Martins, R. P.
	2017
Source Publication	IEEE Transactions on Biomedical Circuits and Systems
ISSN	1932-4545
Pages	44-53
Abstract	In this paper, an ultra-compact single-chip solar energy harvesting IC using on-chip solar cell for biomedical implant applications is presented. By employing an on-chip charge pump with parallel connected photodiodes, a 3.5× efficiency improvement can be achieved when compared with the conventional stacked photodiode approach to boost the harvested voltage while preserving a single-chip solution. A photodiode-assisted dual startup circuit (PDSC) is also proposed to improve the area efficiency and increase the startup speed by 77%. By employing an auxiliary charge pump (AQP) using zero threshold voltage (ZVT) devices in parallel with the main charge pump, a low startup voltage of 0.25 V is obtained while minimizing the reversion loss. A 4Vin gate drive voltage is utilized to reduce the conduction loss. Systematic charge pump and solar cell area optimization is also introduced to improve the energy harvesting efficiency. The proposed system is implemented in a standard 0.18-µm CMOS technology and occupies an active area of 1.54 mm^2. Measurement results show that the on-chip charge pump can achieve a maximum efficiency of 67%.
Keyword	Single-chip solar energy harvesting auxiliary charge pump photodiode-assisted dual startup circuit charge pump/solar cell area optimization
URL	View the original
Language	英語English
The Source to Article	PB_Publication
PUB ID	19437
Document Type	Journal article
Collection	DEPARTMENT OF PSYCHOLOGY
Corresponding Author	Law, M. K.
Recommended Citation GB/T 7714	Chen, Z.,Law, M. K.,Mak, P. I.,et al. A Single-Chip Solar Energy Harvesting IC using Integrated Photodiodes with a 67% Charge Pump Maximum Efficiency[J]. IEEE Transactions on Biomedical Circuits and Systems, 2017, 44-53.
APA	Chen, Z.., Law, M. K.., Mak, P. I.., & Martins, R. P. (2017). A Single-Chip Solar Energy Harvesting IC using Integrated Photodiodes with a 67% Charge Pump Maximum Efficiency. IEEE Transactions on Biomedical Circuits and Systems, 44-53.
MLA	Chen, Z.,et al."A Single-Chip Solar Energy Harvesting IC using Integrated Photodiodes with a 67% Charge Pump Maximum Efficiency".IEEE Transactions on Biomedical Circuits and Systems (2017):44-53.

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