Abstract
VLSI, in modern day technology has seen extensive use of PPA with a better delay performance. These pre-compute the carries and thus have upper hand over the commonly used Ripple Carry Adder (RCA). Addition has been an indispensible operation in most of the widely used applications. We present the 4,8,16 and 32 bit of different adders-Carry Look Ahead (CLA), Carry Save Adder (CSA), Kogge Stone Adder (KSA), Sparse Kogge Stone Adder (SKSA), Brent Kung Adder (BKA), Sklansky Adder, Lander Fischer Adder (LFA) and Han Carlson Adder (HCA). They have been categorized and ranked as per delay, device utilization and cell usage. These adders are implemented in VHSIC Hardware Description Language (VHDL) using Xilinx Integrated Software Environment (ISE) 9.2i Design Suite.
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