Hybrid variable latency carry skip adder in multiplier structures

Abstract

One of the chief successful adder structures is the Carry Skip Adder (CSKA). This is mainly due to its power scattering and lesser area. Truth be told, when compared with the Ripple carry adder (RCA) its speed is higher. The Carry Select Adder (CSLA) is described by a decent productivity in the exchange off between power dissemination and speed when compared to Carry Lookahead Adder (CLA). Area utilization and power utilization of CSKA is almost proportional to RCA, the only difference is the carry propagation delay in RCA. Certain speed limitation in CSKA makes it not useful for high speed applications. Distinctive methodologies are used for the conventional CSKA to make it more efficient in its performance. The proposed CSKA comprises of reversible carry skip logic with incrementation scheme produces less delay and low power consumption. Further when this proposed logic is used in multiplier area, delay and power decreases by 15.87%, 17.63% and 22.68% for Baugh-Wooley multiplier and 16.8%, 42% and 15.01% for Wallace multiplier respectively.