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In this paper, the main challenges of technology scaling are reviewed in depth. Five popular logic families namely; conventional CMOS, complementary pass logic, Domino, differential cascode voltage switch logic, and current mode logic are presented, highlighting their advantages and drawbacks. The behavior of each logic style in deep submicrometer technologies is analyzed and predicted for future technology generations. To verify the qualitative analysis, simulations were performed on the basic logic gates, full adder and a 16-bit carry look ahead adder. The circuits were implemented in 0.8-, 0.6-, 0.35-, and 0.25-μm CMOS technologies, and optimized for minimum energy-delay product.