The power gating is one of the most popular reduction leakage techniques. We make comparison among various power gating schemes in terms of power delay product, energy loss, and wake-up time using the 45-nm Predictive Technology Model. In my conclusion, the Dual-Switch Power Gating (DSPG) shows lower power delay product, smaller energy loss, faster wake-up time than the other power gating schemes such as the Single-Switch and Charge-Recycled Power Gating schemes. Based on these advantages, the DSPG is suggested in this paper as a viable candidate suitable to a fine-grain leakage control scheme, where logic blocks go in and out very frequently and shortly between the active and sleep modes.
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