Implementation of an efficient 64-bit Carry Select Adder using muxes

Carry Select Adder (CSLA) is one of the most commonly used adder circuits in many arithmetic operations. Most of the multipliers and adders make use of CSLA´s. Regular Square root Carry Select Adder(SQRT CSLA) uses two Ripple Carry Adders (RCA), one with carry input as `0´ and the other with carry input as `1´. To reduce the size of regular SQRT CSLA, a Binary to Excess One converter (BEC) is used instead of RCA with carry input `1´. In this paper an implementation of an efficient 8,16,32 and 64 -bit square root Carry Select Adder(CSLA) using modified full adder, is carried out to achieve more power savings comparable to the existing systems.