Cryptographic applications and pseudo random generator perform modular arithmetic three operand is the basic fundamental unit used in all these applications. For performing three operand additions, CSA (carry save adder) is one of the most widely used adders[5]. But in CSA in the final stage, carry is propagated which impacts the delay. Prefix parallel adders are therefore employed to get around this. The parallel prefix adders use more space even though performance in terms of latency is improved. Parallel prefix adders can also be used to build three operand adders. A brand-new, high-speed, and hardware-efficient adder technique is used to boost performance in terms of latency and area. This adder approach uses four stages to achieve three operand addition. Since Han Carlson adder is used in third stage, the suggested adder is not area efficient. To overcome this, in this paper we are replacing the Han Carlson parallel prefix adder with sklansky adder.
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