Discuss how a NOT gate is realised using NAND gates.
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If the two input of the NAND gates are joined to make one input as shown in Fig, then the NAND gate function as a NOT gate. As `y=bar(A.A)=bar(A)+bar(A)=bar(A)` In the truth table of NAND gate, if we use B=A, we obtain the truth table as given in Fig., which is the truth table of NOT gate. `|(A,B=A,Y),(0,0,1),(1,1,0)|`
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