--->In this project,variable latency speculative HAN-CARLSON ADDER is designed for reducing the delay when compared to kogge stone adder.
---->PPA[parallel prefix adder]consist of following types
1)HAN-CARLSON ADDER
2)KOGGE STONE ADDER
3)BRENT KUNG ADDER
4)LADNER FISCHER ADDER
5)SKLANSKY ADDER
--->HAN CARLSON stage reduces from 1+log2(n)to 1+log2(k)
VARIABLE LATENCY SPECULATIVE HAN CARLSON ADDER
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