Daeyeon Kim, Yoonmyung Lee, et al.
ISLPED 2009
An 8.75 mm3 microsystem targeting temperature sensing achieves zero-net-energy operation using energy harvesting and ultra-low-power circuit techniques. A 200 nW sensor measures temperature with-1.6°C/+3°C accuracy at a rate of 10 samples/sec. A 28 pJ/cycle, 0.4 V, 72 kHz ARM Cortex-M3 microcontroller processes temperature data using a 3.3 fW leakage per bit SRAM. Two 1 mm2 solar cells and a thin-film Li battery power the microsystem through an integrated power management unit. The complete microsystem consumes 7.7 μ W when active and enters a 550 pW data-retentive standby mode between temperature measurements. The microsystem can process temperature data hourly for 5 years using only the initial energy stored in the battery. This lifetime is extended indefinitely using energy harvesting to recharge the battery, enabling energy-autonomous operation. © 1966-2012 IEEE.
Daeyeon Kim, Yoonmyung Lee, et al.
ISLPED 2009
Yoonmyung Lee, Daeyeon Kim, et al.
IEEE Transactions on VLSI Systems
Scott Hanson, Mingoo Seok, et al.
IEEE Journal of Solid-State Circuits