Citation

Lim, Michelle S. M. and Islam, Md. Shabiul and Sawal, M. A. and Razak, Zulhakimi and Yeo, K. H. and Wong, Hin Yong (2020) Sub-threshold start-up circuit with dynamic body-biasing for boost converters in thermoelectric energy harvesting. Sādhanā, 45 (1). ISSN 0256-2499, 0973-7677

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Abstract

A 260 mV start-up charge pump and oscillator applying dynamic bulk-biasing (DBB) for step-up converters in thermal energy harvesting is presented and validated through SPICE simulation. This DBB employs a dynamic substrate control circuit (DSCC) directly controlled by the pump clock. It can dynamically reduce sub-threshold leakages during off-state and increase conduction during on-state. This is necessary for thermoelectric harvesters with output voltages of ≤ 300 mV. Performance of this DBB start-up circuit is compared to those of conventional reverse and forward bulk-biasing charge pumps. According to simulated results using the TSMC180 nm CMOS model, DBB reduces kick-start voltage to 225 mV. This proposed circuit has a 1.44×–52× better overall figure-of-merit (FOM) compared with conventional circuits at a supply voltage of 260 mV. It can generate 50 μW of maximum power with an unregulated output of 2.5 V within 171 μs from cold start-up. This overall improvement in speed, power and pumping efficiency facilitates battery-less solutions in biomedical applications for wearable/implanted micro-devices.

Item Type:	Article
Uncontrolled Keywords:	energy harvesting, Sub-threshold, start-up circuit, charge pump, dynamic body-biasing
Subjects:	T Technology > TK Electrical engineering. Electronics Nuclear engineering > TK2896-2985 Production of electricity by direct energy conversion
Divisions:	Faculty of Engineering (FOE)
Depositing User:	Ms Rosnani Abd Wahab
Date Deposited:	13 Dec 2020 11:58
Last Modified:	13 Dec 2020 11:58
URII:	http://shdl.mmu.edu.my/id/eprint/7823

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