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Millimeter-scale nearly perpetual sensor system with stacked battery and solar cells

Millimeter-scale nearly perpetual sensor system with stacked battery and solar cells,10.1109/ISSCC.2010.5433921,Gregory Chen,Matthew Fojtik,Daeyeon Ki

Millimeter-scale nearly perpetual sensor system with stacked battery and solar cells   (Citations: 18)
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An 8.75 mm3 sensor system is implemented with a near-threshold ARM Cortex-M3 core, custom 3.3 fW leakage-per-bit SRAM, two 1 mm2 solar cells, a thin-film Li-ion battery, and an integrated power management unit. The 2.1 ¿W system enters a 100 pW data-retentive sleep state between sensor measurements and harvests energy from the solar cells to enable nearly perpetual operation.
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