CBSE Class 12 · 2000 · SemiconductorsShort Answer

The following table gives the output of a two-input logic gate:

A = 0, B = 0, Y = 1

;

A = 1, B = 0, Y = 1

;

A = 0, B = 1, Y = 1

;

A = 1, B = 1, Y = 0

.
(i) Identify the logic gate and draw its logic symbol.
(ii) If the output of this gate is fed as input to a NOT gate, name the new logic gate so formed.

Solution

(i) The output is

0

only when both inputs are

1

, which is the NAND operation

Y = \overline{A \cdot B}

; its symbol is an AND symbol with an output bubble.
(ii) Passing

Y = \overline{A \cdot B}

through a NOT gate gives

\overline{\overline{A \cdot B}} = A \cdot B,

which is an AND gate.

(i) NAND; (ii) AND.

CBSE Class 12 Board · 2000 · Subjective

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