9 Delay Analyzing Between KS, SKS, Spaning Tree and Brentkung Adders

Abstract--: Adders are known to have the frequently used in VLSI designs. In digital design we have half adder and full adder, main adders by using these adders we can implement ripple carry adders. RCA use to perform any number of addition. In this RCA is serial adder and it has commutation delay problem. If increase the ha&fa simultaneously delay also increase. That’s why we go for parallel adders(parallel prefix adders). In the parallel prefix adder are ks adder(kogge-stone),sks adder(sparse kogge-stone),spaning tree and brentkung adder. These adders are designed and caparisoned by using of area and delay constraints. Simulated and synthesis by model sim6.4b, Xilinx ise10.1 IndexTerms- RCA, KS, SKS, Spanning tree, Brentkung adder