Conventional adders like BINARY ADDITION, HALFADDER [HA], FULLADDER [FA], Ripple Carry Adder [RCA], Carry Look ahead Adder [CLA] and Carry Skip Adder [CSA] cannot satisfy optimization goals so, in this paper we proposed four types of Parnell prefix adders like Kogge Stone Adder [KSA], Spanning Tree Adder [STA], Brent Kung Adder [BKA] and Sparse Kogge Stone Adder [SKA] to achieve high speed and area optimization. Then we are generated a new hybrid adder using KSA and BKA. this adder takes less area and low power .These adders are designed using [VHSIC] Hardware Description Language [HDL] and simulation, synthesis using Xilinx Integrated Software Environment [ISE] 13.2 Design Suite. These designs are implemented in Xilinx SPARTAN 3E Field Programmable Gate Arrays [FPGA]. INTRODUCTION Adders are commonly found in the critical path of many building blocks of microprocessors and digital signal processing chips. Adders are essential not only for addition, but also for subtraction, multiplication, and division. Addition is one of the fundamental arithmetic operations. A fast and accurate operation of a digital system is greatly influenced by the performance of the resident adders. The most important for measuring the quality of adder designs in the past were propagation delay, and area. Adders are the basic building blocks of all arithmetic circuits; adders add two binary numbers and give out sum and carry as output. Basically we have two types of adders. The design of a binary adder begins by considering the process of addition in base 2, in this example, the two numbers to be added, 1101 + 0110, are written one above the other. The carries from one position to the next [called internal carries] are written above them. The result is the 5-bit number 10011. Interpreting the values of the binary numbers, this sum corresponds to the decimal addition 13 + 6 = 19.From this example, we observe that the problem of adding two 4-bit numbers can be reduced to the problem of adding a column of two or three bits and passing the carry along to the next column. [For the sake of regularity, we can all in a 0 as the input carry in the rightmost column, so then each column is always the sum of three bits.] A circuit that adds a column of three bits is called a full-adder. [The name full-adder comes from the fact that it can be constructed by combining two half-adders, each of which adds only two bits, in a way that we shall see shortly.] We can design such a Circuit by making a table listing

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can anyone tell the difference between carry look ahead adder and carry save adder with there advantages and disadvantages and where it is pratically used

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Carry skip adder [CSA] and carry look ahead adder [CLA] are both high-speed adders used in digital circuits. While CSA is known for its ability to reduce the number of logic gates and improve speed, CLA is known for its efficient power-delay product [PDP] and energy consumption. In terms of area and power consumption, CLA with an approximate adder has been shown to be effective in reducing complexity . On the other hand, a high-speed and energy-efficient architecture for CLA has been proposed, achieving a reduction in critical path delay, power, and PDP compared to conventional CLA and other adders like CSA and Kogge-Stone adder [KSA] . Additionally, a GDI-based design for CLA has been shown to enhance performance and reduce transistor count compared to conventional S-CMOS based designs . Therefore, the choice between CSA and CLA depends on the specific requirements of the application, such as speed, power consumption, and area constraints.

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