Design Of Area And Speed Efficient Square Root Carry Select Adder Using Fast Adders
K.Mariya Priyadarshini, N.V.N. Ravi Kiran, N. Tejasri, T.C. Venkat Anish
Key Words: fast adders, Carry Select Adder (CSA), Modified Carry Select Adder (MCSA), Carry Skip Adder (CSA), Carry Look-Ahead Adder (CLA).SQCSA, Modified SQCSA.
Abstract: Area and speed are the most important design objectives in integrated circuits. As addition is the basic operation of all computer arithmetic, adders are one of the widely used components in digital integrated circuit design. Since propagation of carry is of major concern in designing efficient adders, this paper presents different fast adders and their performance analysis. Among all the adders discussed Square root Carry Select Adder (SQCSA) provides a good compromise between cost and performance. As, Conventional SQCSA is still area consuming due to dual Ripple Carry Adder(RCA)structures, modifications are done at gate level to reduce area. Modified SQCSA is designed using fast adders like Carry Skip Adder (CSA) and Carry Look-Ahead Adder (CLA) to increase the speed of operation.
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