A latency optimized biased implementation style weak-indication self-timed full adder

This article presents a biased implementation style weak-indication self-timed full adder design that is latency optimized. The proposed full adder is constructed using the delay-insensitive dual-rail code and adheres to the 4-phase handshaking. Performance comparisons of the proposed full adder vis-à-vis other strong and weak-indication full adders are done on the basis of a 32-bit self-timed ripple carry adder architecture, with the full adders and ripple carry adders realized using a 32/28nm CMOS process. The results show that the proposed full adder leads to reduction in latency by 63.3% against the best of the strong-indication full adders whilst reporting decrease in area by 10.6% and featuring comparable power dissipation. On the other hand, when compared with the existing optimized weak-indication full adder, the proposed full adder is found to minimize the latency by 25.1% whilst causing an increase in area by just 1.6%, however, with no associated power penalty.