Design and Implementation of a High Speed CSKA Brent Kung Adder

Abstract

: In order to perform the addition of two numbers adder is used. Adder also forms the integral part of ALU. Besides this application of adder in computer, it is also employed to calculate address and indices and also operation codes. Different algorithm in Digital Signal Processing such as FIR and IIR are also employed using adder. The important areas of VLSI areas are low power, high speed and data logic design. In Carry Select adder the possible value of input carry are 0 and 1. So in advance, the result can be calculated. Further we have the multiplexer stage, for calculating the result in its advanced stage. The conventional design is the use of dual Ripple Carry Adders (RCAs) and then there is a multiplexer stage. Here, one RCA (Cin=l ) is replaced by Brent kung adder. As, RCA (for Cin=O) and Brent Kung adder (for Cin=l ) consume more chip area, so an add-one scheme i.e., Binary to Excess-l converter is introduced. Also the square root adder architectures of CSA are designed using Brent Kung adder in order to reduce the power and delay of adder.