Ultra low power on-chip hybrid start-up for wireless sensor networks

Vamsi, N and Gupta, A and Dutta, Asudeb and Singh, Shiv Govind (2015) Ultra low power on-chip hybrid start-up for wireless sensor networks. In: Nordic Circuits Systems Conference (NORCAS): NORCHIP & International Symposium on System Chip (SoC), OCT 26-28, 2015, Oslo, NORWAY.

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This paper presents ultra low power hybrid energy harvesting start-up circuit for 1V, implemented in a standard 0.18 mu m CMOS technology. It consists of solar and RF energy harvesters, capable to harvest ambient solar and RF sources respectively. The start-up circuit enables operation of the system even in the absence of any one of these ambient energy sources. The integration of solar and RF on a common platform provides improved charging time in crucial start-up phase. In general, to charge the super capacitor (Cstartup=100pF) to 1V, the solar energy harvester alone (with minimum input voltage of 317mV) will take a charging time of 542.3 mu s. With the addition of RF interface, the charging time is drastically reduced to 86.8 mu s, for -26dBm input power level, at 953MHz providing a 83.9% reduction in start-up time. The start-up circuit delivers output power of 7.4 mu W with an efficiency of 68.5% for the combined solar and RF input at 317mV and -20dBm respectively.

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IITH Creators:
IITH CreatorsORCiD
Singh, Shiv Govindhttp://orcid.org/0000-0001-7319-879X
Item Type: Conference or Workshop Item (Paper)
Uncontrolled Keywords: Wireless Sensor Network (WSN); Power Conversion Efficiency (PCE); Voltage doubler; Hybrid energy harvesting
Subjects: Others > Electricity
Divisions: Department of Electrical Engineering
Depositing User: Team Library
Date Deposited: 01 Sep 2016 10:57
Last Modified: 11 Sep 2017 09:27
URI: http://raiith.iith.ac.in/id/eprint/2712
Publisher URL: https://doi.org/10.1109/NORCHIP.2015.7364415
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