Design of high speed carry save adder using carry lookahead adder

Addition is one of the essential operations in Digital Signal Processing (DSP) applications which includes Fast Fourier Transform (FFT), Digital filters, multipliers etc. With the advancements in technology, research is still going on to design a adder that performs addition in flash of time. One of such high speed adder is Carry Save Adder (CSA). In this paper we have designed High Speed Carry Save Adder (CSA) using Carry Look ahead adder in the final stage instead of using conventional ripple carry adder [1] so that speed increases by 27.5%.