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One of the Co-founders of Intel, Gordon Moore, observed that “the number of transistors and resistors on a chip doubles every 24 months”, and the computer industry adopted it as the well-known Moore's law and became a performance metric in the semiconductor or computer chip industry. As more transistors were being packed into a single small-sized chip,^[1]. the sizes of computing and network equipment decreased significantly, translating to a significant decrease in power consumption. Although advanced chip manufacturing has dramatically reduced the transistor gate length, current leakage has increased, increasing chip power consumption and heat dissipation. Thus, doubling the number of transistors on the chip could double the amount of power consumed by the chip ^[2].