JEE Main · 2026 · 28 Jan 2026 · Shift 2 · Semiconductors

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 ______.

Answer: (D)

Solution

In the circuit a resistor pulls the output

C

up towards

V_{d c} = 5

V, and the two diodes connect the inputs

A

and

B

C

with their cathodes on the input side. If either input is low, that diode is forward biased and conducts, clamping

C

to the low level. Only when both inputs are high are both diodes reverse biased, allowing the resistor to hold

C

at the high level. The output is high solely for

A

and

B

both high, which is the behaviour of an AND gate.

JEE Main · 2026 · 28 Jan 2026 · Shift 2 · Single correct option