Design A Full Adder Circuit Using Decoder And Multiplexer

By | June 23, 2022



We’ve all heard of the importance of digital circuits in our modern world, but how do we go about designing them? In this article, we’ll explore the process of designing a full adder circuit using decoders and multiplexers.

A full adder is an important digital logic circuit that combines two input items – A and B – and produces a sum (S) and carry (C). This type of circuit is essential for performing arithmetic operations like addition and subtraction. The full adder circuit is built using two main components: a decoder and a multiplexer.

The decoder translates binary information into decimal format. This is done by connecting the decoder input to A and B. The decoder then reads the inputs and decides which of the four possible output connections – A, B, C and D – should be activated. The multiplexer then takes the decoder output and sends it to the sum and carry outputs.

This process is repeated each time two new inputs are used. The multiplexer chooses between two inputs – the decoder output and the complementary output of the decoder. Depending on which input is chosen, the multiplexer sends the corresponding output to the sum or carry output.

For example, if the decoder output is ‘0’, then the multiplexer will send a ‘1’ to the sum output. Conversely, if the decoder output is ‘1’, then the multiplexer will send a ‘0’ to the carry output. This process is continued until both the sum and carry output have been determined.

In conclusion, designing a full adder circuit using decoders and multiplexers is an essential step for any digital circuit design. By understanding the process of combining two inputs – A and B – and producing a sum and carry, designers can create powerful digital circuits that can help solve a variety of problems. With a clear understanding of the process, engineers can create more complex circuits and develop better computational solutions.


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