Question:
Given : A and B are input terminals.
Logic 1 = > 5 V
Logic 0 = < 1 V
Which logic gate operation, the following circuit does ?
Given : A and B are input terminals.
Logic 1 = > 5 V
Logic 0 = < 1 V
Which logic gate operation, the following circuit does ?
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The diodes point towards the inputs: a low input forward-biases its diode and pulls the output low; only when both inputs are high are both diodes off and the output stays high.
Updated On: Nov 11, 2026
- AND Gate
- OR Gate
- XOR Gate
- NOR Gate
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The Correct Option is A
Solution and Explanation
Each diode has its cathode at the input terminal, so it conducts when its input is low (\(\lt 1\) V) and the potential at the common (output) node is pulled down to the low level, since the series resistance 50 \(\Omega\) is small compared with the 10 k\(\Omega\) resistor.
A = 0, B = 0: both conduct, Vout = 0.
A = 0, B = 1: the diode at A conducts, Vout is pulled low = 0.
A = 1, B = 0: Vout = 0.
A = 1, B = 1 (> 5 V): both diodes are reverse biased, Vout stays high = 1.
Output is 1 only when both inputs are 1: AND gate.
Answer: (1) AND Gate
A = 0, B = 0: both conduct, Vout = 0.
A = 0, B = 1: the diode at A conducts, Vout is pulled low = 0.
A = 1, B = 0: Vout = 0.
A = 1, B = 1 (> 5 V): both diodes are reverse biased, Vout stays high = 1.
Output is 1 only when both inputs are 1: AND gate.
Answer: (1) AND Gate
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