Design optimization of a fully integrated charge-pump with LC tank oscillator for ultra-low voltage energy harvesting

Jayaweera, H. M. P. C.
Muhtaroglu, Ali
Model based optimization of a novel integrated interface circuit topology is presented for low voltage DC-DC step-up conversion. A cross-coupled charge pump is implemented in standard 0.18 mu m CMOS technology using an integrated LC tank oscillator to enable a compact, low cost, self-starting solution with maximum efficiency at ultra-low input voltage levels available from embedded micro-power generators. The voltage doubling oscillator can start up with input as low as 0.10 V. Full system can step 0.2 V up to 1.7 V to supply >400 mu V to 6 k Omega load with 46.5% efficiency based on post-layout simulations. The minimum simulated input voltage is 0.11 V, which is boosted up to 1.0 V under open circuit conditions. The optimized system thorough the established model improves output power and efficiency more than 30% compared to the alternatives. The compact LC tank leads to 17% area reduction compared to the conventional VCO with four planar inductors.


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Citation Formats
H. M. P. C. Jayaweera and A. Muhtaroglu, “Design optimization of a fully integrated charge-pump with LC tank oscillator for ultra-low voltage energy harvesting,” MICROELECTRONICS JOURNAL, pp. 33–39, 2017, Accessed: 00, 2020. [Online]. Available: