Optimized Full Swing Gate Diffusion Input Logic in Low Power Design
Keywords:
GDI, FSGDI, Low power, Boolean, VLSI, Minimum Energy operation PointAbstract
Power, delay and area optimized design techniques are consistently on high demand in semiconductor industry. Optimization techniques at system, architecture, gate and transistor levels are explored by researchers to combat the requirements of low power chips needed for industries. Grain level optimizations at gate and transistor levels offers higher reduction in power when compared with system and architectural levels. This paper focuses on optimization of Gate diffusion Input technique, a gate level approach for low power. This research presents the fact that Full Swing Gate Diffusion Input technique offers power, delay and area efficient circuits only for Boolean functions realized with a greater number of complemented literals rather than functions with true literals. This finding was verified by the implementation of Boolean functions exclusively comprising of true literals and complementary literals. The results depicted that Full Swing Gate Diffusion Input implementation is suitable only for Boolean functions comprising of complementary literals. For functions with true literals, the equations have to be modified to exploit the benefits of Full Swing Gate Diffusion Input techniques. The implementation was extended to realization of the state of the art 1-bit full adder, using conventional CMOS, direct FSGDI and modified FSGDI. On comparison with conventional CMOS full adder, modified FSGDI with more complementary literals presented a significant 86% reduction in Power Delay Product when compared with direct FSGDI full adder that presented 23% reduction. Maximum reduction of power in FSGDI circuits can be realized when the circuits are modified for implementation with complementary literals.
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