An efficient SQRT architecture of Carry Select adder design by Common Boolean logic

Abstract

Carry Select adder (CSLA) is known to be the fastest adder among the Conventional adder structures. This work uses an efficient Carry select adder by sharing the Common Boolean logic (CLB) term. After a logic simplification, we only need one OR gate and one inverter gate for carry and summation operation. Through the multiplexer, we can select the correct output according to the logic states of the carry in signal. Based on this modification Square root CSLA (SQRT CSLA) architecture have been developed and compared with the regular and Modified SQRT CSLA architecture. The Modified CSLA architecture has been developed using Binary to Excess -1 converter (BEC). This paper proposes an efficient method which replaces a BEC using common Boolean logic. The result analysis shows that the proposed architecture achieves the three folded advantages in terms of area, delay and power.