Abstract:
An energy-harvesting wireless sensor node (WSN) integrates a 14-nm, 0.79-mm2, 32-b Intel Architecture corebased near-threshold voltage (NTV) microcontroller (MCU) that pr...Show MoreMetadata
Abstract:
An energy-harvesting wireless sensor node (WSN) integrates a 14-nm, 0.79-mm2, 32-b Intel Architecture corebased near-threshold voltage (NTV) microcontroller (MCU) that provides 17-μW/MHz always-ON, always-sensing (AOAS) capability. The MCU implements four independent voltage-frequency islands, managed by an integrated power management unit and features a subthreshold voltage capable on-die oscillator and 42-nm fin-pitch, 8.3-pA leakage-per-bit SRAM. The MCU operates across a wide frequency (voltage) range from 297 MHz (1 V) to 0.5 MHz (308 mV), dissipating 23.5 mW to 21 μW, and achieves 4.8× better energy efficiency at an optimum supply voltage (VOPT) of 370 mV, 3.5 MHz, and 17 pJ/cycle. A functional AOAS WSN incorporating the NTV MCU shows promise for sustained μW operation.
Published in: IEEE Journal of Solid-State Circuits ( Volume: 52, Issue: 4, April 2017)