Rounding Multiplier to Improve the efficiency using Brent Kung Adder
R Arul · International Journal for Research in Applied Science and Engineering Technology · 2019
In this paper, we propose an approximate multiplier to improve the efficiency over the traditional approximate multiplier, which is commonly based on rounding technique. In general, the approximate multipliers are used to achieve high performance with a huge trade-off in accuracy. The Brent-Kung adder, which is a pruned version of Kogge-Stone adder has a better accuracy trade-off. The proposed approximate multiplier, which uses the Brent-Kung adder shows better performances in terms of area, power consumption and speed than the Kogge-Stone based rounding approximate multiplier. The designed multipliers have been simulated using Cadence Encounter(R) RTL compiler with 180nm technology.The proposed multiplier based on gate pruning achieves power savings of 12% and speed to improved 74% compared to kogge stone based rounding multiplier. The proposed multiplier will be applied for real-time application in future.