Multithreshold cmos mainly used to reduce the leakage power during long periods of inactivity mode.power gating scheme used to support multiple power off modes and reduce the leakage power at the time of short periods of inactivity.Power gating used to reduce the leakage power,four transistor used to make a power gate structure.In future the leakage power will be stored in charge pump circuit. 4375 simultaneously, the resulting "rush current" can compromise the power network integrity. The

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... it needs to be switched in stages in order to prevent this. 3)Power gate leakage: Since power gates are made of active transistors, leakage reduction is an important consideration to maximize power savings. III MULTIMODE POWER SWITCHES An effective and robust multimode power-gating architecture that has none of the above drawbacks. The existing structure requires minimal design effort since it is very simple, and with no analog components. It is considerably smaller than the architecture existing and offers greater power savings for similar wake-up times. The proposed architecture is also more tolerant to process variations; thus its operation is more predictable. A reconfigurable version of the proposed architecture is also proposed, which can tolerate even greater process variations, enabling thus the utilization of the proposed architecture for newer technologies.