Leakage-enhanced 3D-Stacked NEMFET-based power management architecture for autonomous sensors systems

With the technology moving into the deep sub-100 nm region, the increase of leakage power consumption necessitates more aggressive power reduction techniques using emerging devices. Power gating with Nano-Electro-Mechanical Field Effect Transistors (NEMFET) is a promising avenue to reduce energy consumption of embedded autonomous sensor systems. Our research emphasizes that 3D Stacked hybrid circuits with NEMFET sleep transistors can be further enhanced to reduce leakage power by redesigning the entire power management circuitry with NEMFETs. To evaluate the practical implications of such an approach we implement NEMFET based power gating, which makes use of NEMFETs as sleep transistors, isolation cells, and components for power management controller design, on an embedded SoC platform running a bio-medical sensing application. Preliminary energy evaluations with Cadence EDI flow indicate that the enhanced architecture provides a reduction of 7% over the 3D Hybrid architecture at the expense of 4.7% area increase and of about 15% energy reduction with respect to the "classic" 2D CMOS counterpart. Furthermore, for applications with lower activity, the potential energy improvement the enhanced architecture could provide can reach up to 90% with respect to the 2D CMOS reference design.