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Semiconductors

JEE Main level, single correct, medium

113 of 209

Question 113 of 209

Two p-n junction diodes $D_{1}$ and $D_{2}$ are connected as shown in figure. $A$ and $B$ are input signals and $C$ is the output. The given circuit will function as a $\_\_\_\_$ .

Show answer and solution

Answer: (D) AND Gate

A = 0

and

B = 0

: Both diodes are forward biased. The potential at

C

is pulled down to approximately

0V

(logic 0).
If

A = 0

and

B = 1

: Diode

D_1

is forward biased, pulling the potential at

C

down to

0V

(logic 0). Diode

D_2

is reverse biased.
If

A = 1

and

B = 0

: Diode

D_2

is forward biased, pulling the potential at

C

down to

0V

(logic 0). Diode

D_1

is reverse biased.
If

A = 1

and

B = 1

: Both diodes are reverse biased. No current flows through the resistor

R

, so the potential at

C

remains at

V_{dc} = 5V

(logic 1).
The truth table is:
A B C 000010100111
This truth table corresponds to the AND gate logic operation

C = A \cdot B

.
Therefore, the circuit functions as an AND gate.

JEE Main question paper PDF

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JEE Main 2025 Apr 2 Shift 1 question paper

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More Physics practice

JEE Main Physics practice question on Semiconductors (Logic Gates), with the answer and a step-by-step solution. Scan a question from your own book or paper to get a whiteboard video.

Two p-n junction diodes D1D_{1}D1​ and D2D_{2}D2​ are connected as shown in figure. AAA and BBB are input signals and CCC is the output. The given circuit will function as a ____\_\_\_\_____.

JEE Main question paper PDF

More Physics practice

Two p-n junction diodes $D_{1}$ and $D_{2}$ are connected as shown in figure. $A$ and $B$ are input signals and $C$ is the output. The given circuit will function as a $\_\_\_\_$ .