Energy-Efficient Start-up Power Management for Batteryless Biomedical Implant Devices (original) (raw)

Oo Htet, Kaung, Zhao, Jinwei, Ghannam, Rami ORCID: https://orcid.org/0000-0001-6910-9280 and Heidari, Hadi ORCID: https://orcid.org/0000-0001-8412-8164(2019) Energy-Efficient Start-up Power Management for Batteryless Biomedical Implant Devices. In: 25th IEEE International Conference on Electronics, Circuits and Systems (ICECS), Bordeaux, France, 9-12 Dec 2018, pp. 597-600. ISBN 9781538695623(doi: 10.1109/ICECS.2018.8617874)

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Abstract

This paper presents a solar energy harvesting power management using the high-efficiency switched capacitor DC-DC converter for biomedical implant applications. By employing an on-chip start-up circuit with parallel connected Photovoltaic (PV) cells, a small efficiency improvement can be obtained when compared with the traditional stacked photodiode methodology to boost the harvested voltage while preserving a single-chip solution. The PV cells have been optimised in the PC1D software and the optimal parameters modelled in the Cadence environment. A cross-coupled circuit with level shifter loop is also proposed to improve the overall step up voltage output and hybrid converter increases the start-up speed by 23.5%. The proposed system is implemented in a standard 0.18-μm CMOS technology. Simulation results show that the 4-phase start-up and cross coupled with level-shifter can achieve a maximum efficiency of 60%.

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