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Semiconductor Electronics: Materials, Devices and Simple Circuits
Logic Gates: Universal NAND Gate
1 question from 1 paper, each with its answer.
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Concepts tested
- NAND followed by NOT gives AND
All Questions
2003 AIPMT 1 question
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Following diagram performs the logic function of :
Output of the first NAND gate: $X = \overline{A \cdot B}$
The second NAND gate has both inputs joined, so it works as a NOT gate: $Y = \overline{X \cdot X} = \overline{X}$
$Y = \overline{\overline{A \cdot B}} = A \cdot B$
So the circuit performs the logic function of an AND gate.