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Presents a high-speed 64-bit hybrid carry-lookahead/carry-select adder in 0.1 /spl mu/m partially depleted silicon-on-insulator (PD/SOI) technology with a critical path delay of 346 ps. Sense-amplifier based differential logic with source follower evaluation tree is used for fast generation of 8-bit group carry. Floating body PD/SOI shows 24% performance improvement over bulk CMOS for the 8-bit group carry generating circuit. We also show that the proposed circuit is robust to noise induced by floating body effect in PD/SOI.