The design consisted of modular components, utilizing a 1-bit Full Adder as the building block. These Full Adders were cascaded to handle the 4-bit addition, producing a 4-bit sum output and a carry ...

Figure 5. The four-bit adder circuit. 4 For each of these circuits, starting with the half-adder, you will make the proper connections between each level of organization in your objects. You will use ...

A 4-bit ripple carry adder in QCA is then designed using the proposed Feynman and Toffoli gates to realize a reversible QCA full adder. This 4-bit QCA adder with reversible logic consists of 2030 QCA ...

This paper focuses on the implementation and simulation of 4-bit, 8-bit and 16-bit carry look-ahead adder based on Verilog code and compared for their performance in Xilinx.