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Batteryless energy harvesting systems face a twofold challenge in converting incoming energy into forward progress. Not only must such systems contend with inherently weak and fluctuating power sources, but they have very limited temporal windows for capitalizing on transitory periods of above-average power. To maximize forward progress, such systems should aggressively consume energy when it is available,...
Nonvolatile processors (NVPs) have integrated nonvolatile memory to preserve task-intermediate on-chip state during power emergencies. NVPs hide data backup and restoration from the executing software to provide an execution mode that will always eventually complete the current task. NVPs are emerging as a promising solution for energy-harvesting scenarios, in which the available power supply is unstable...
Energy harvesting systems without an energy storage device have to efficiently harness the fluctuating and weak power sources to ensure the maximum computational progress. While a simpler processor enables a higher turn-on potential with a weak source, a more powerful processor can utilize more energy that is harvested. Earlier work shows that different complexity levels of nonvolatile microarchitectures...
This article provides insights into the design of nonvolatile processors (NVPs) for batteryless applications in the Internet of Things (IoT), in which ambient energy-harvesting techniques provide the power. Achieving reliable, continuous, forward computation with an unstable, intermittent power supply motivates the transition from conventional volatile processors to emerging NVPs. The authors discuss...
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