480 ps 64-bit race logic adder

In this paper, a high-speed 64-bit carry look-ahead adder is implemented by race logic for fast carry generation. G/sup 1/g/G/sup 1/k (Level 1 Group Generate/Kill) and G/sup 2/g/G/sup 2/k (Level 2 Group Generate/Kill) stages are designed by race logic. The adder consists of 4-stages, and clk-S63 delay is 480 ps with 0.18 /spl mu/m CMOS technology.