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With the demand for portable and battery-operated gadgets and devices rapidly ramping up, energy consumption of digital circuits becomes a major concern. The rising complexity of computing and processing requires faster devices such as field-programmable gate arrays (FPGAs) and other processing chips. Complicated processes demand higher power, which in turn causes fast chips to heat.

Figure 1 shows that the process technology trend in device dimensions is scaling down to the nanometer range. This necessitates a corresponding reduction in operating voltages, optimizing processing speed, and expanding the operational lifespan of devices.³