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In this paper, the proposed flip-flop reduces power consumption by reducing the clock switching power that was wasted otherwise. Unlike many other gated flip-flops, the proposed gated flip-flop has state retention property to save power and to switch circuit between idle and active modes smoothly. The feedback path is also improved in the proposed flip-flop to decrease power dissipation. The proposed clock-gating scheme only requires 4 transistors, thus occupies the small silicon area. Further, the proposed clock gating network can be shared among a group of flip-flops to reduce the power and area overhead of the gating network. The simulation results show that for all supply voltages, the proposed flip-flop has the least power dissipation among all the designs for low switching activities. The proposed flip-flop has up to 7.82 times power improvement than the existing flip-flops. However, for 100% data activity, the proposed FF consumes up to 2.71 times power than the existing flip-flops. The proposed clock gated flip-flop structure is best suited for applications where input signal switching activity is low and speed is not a crucial factor.

Clock Gated Single-Edge-Triggered Flip-Flop Design with Improved Power for Low Data Activity Applications