JEE Main · 2008 · 27 Apr 2008 · Offline · Semiconductors

In the circuit below, A and B represent two inputs and C represents the output. The circuit represents

(A)NOR gate
(B)AND gate
(C)NAND gate
(D)OR gate✓ Correct

Answer: (D)

Solution

Reading the diode network, each input is tied to the output through a diode arranged so that a high level at either input drives the common output high. If

A

B

or both is at logic

1

, the corresponding diode conducts and pulls

C

up to

1

; only when both inputs are held at

0

does the output stay at

0

. An output that is high whenever any input is high is exactly the behaviour of an OR gate.

JEE Main · 2008 · 27 Apr 2008 · Offline · Single correct option

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