Low-power and area-efficient carry select adder using modified BEC-1 converter

Abstract

Carry Select Adder (CSLA) is one of the fastest adders used in many data-processing processors to perform fast arithmetic functions. From the structure of the CSLA, it is clear that there is scope for reducing the area and power consumption in the CSLA. This work uses a simple and efficient transistorlevel modification in BEC-1 converter to significantly reduce the area and power of the CSLA. Based on this modification 16-b square-root CSLA (SQRT CSLA) architecture have been developed and compared with the SQRT CSLA architecture using ordinary BEC-1 converter. The proposed design has reduced area and power as compared with the SQRT CSLA using ordinary BEC-1 converter with only a slight increase in the delay. This work evaluates the performance of the proposed designs in terms of delay, area, and power by hand with logical effort and through Cadence Virtuoso. The results analysis shows that the proposed CSLA structure is better than the SQRT CSLA with ordinary BEC-1 converter.