Comparative Analysis of Fast Adder Circuit

Abstract: Digital systems are the most important part of VLSI industry. To ensure fast computation fast circuits are required. Adders are the key component of digital design. This paper refers to the comparative analysis of various Adder circuits based on the parameters like propagation delay, no. of Look up tables utilized, no. of Input Output Blocks required and total memory utilization of adder circuit. The adder circuits like Carry Save Adder, Ripple Carry Adder and Carry Look ahead Adders are designed & simulated for 4 inputs each of 4 bit addition operation using XILINX ISE 9.2i.

Keywords: Carry Save Adder, Carry Look ahead Adder, VHDL Simulation.