Comparative Study and Designing of Look Ahead Carry Adder and Ripple Carry Adder

Provided by: International Journal of Research in Electronics and Computer Engineering (IJRECE) Topic: Hardware Date Added: Dec 2013 Format: PDF
There are two types of adders which are going to be explained in this paper viz. Ripple Carry Adder (RCA) and Look-ahead Carry Adder (LCA). These both kinds of adders are used for adding purpose. In this paper, both adders are designed for 4-bit addition operation. The difference between look ahead carry adder and ripple carry adder is proposed in this paper. Both these adders have been designed using a VHDL (Very high speed integrated circuit Hardware Description Language) tool named Xilinx ISE Design Suite 12.4-1. In VHDL tool, structural modeling is implemented on the above mentioned adders. This paper is focusing on difference between these adders based on their performance.

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