A 4GHz 300mW 64b integer execution ALU with dual supply voltages in 90nm CMOS

A 64b integer execution ALU is described for 4GHz single-cycle operation with a 32b mode ALU latency of 7GHz. The 0.073mm/sup 2/ chip is fabricated in a 90nm dual-V, CMOS technology and dissipates 300mW. Sparse-tree adder architecture, single-rail dynamic circuits, and a semidynamic implementation enable a 20% performance improvement and a 56% energy reduction compared to a Kogge-Stone implementation.