Nano-watt power management and vibration sensing on a dust-size batteryless sensor node for ambient intelligence applications

Abstract

Nano-watt-power circuit techniques that accumulate energy from nanoampere-level currents and continuously sense vibration are used for dust-sized batteryless sensor nodes. A chip is fabricated using a 0.35 ¿m CMOS process. The vibration is sensed with 0.7 nW and the energy is accumulated from a 1 nA current source with voltage monitoring.