A logic gate circuit has two inputs A and B and output Y. The voltage waveforms of A, B and Y are shown below.
Fig. Logic gate circuit
The logic gate circuit is :
A logic gate circuit has two inputs A and B and output Y. The voltage waveforms of A, B and Y are shown below.
The logic gate circuit is :
- AND gate
- OR gate
- NOR gate
- NAND gate
The Correct Option is A
Approach Solution - 1
To determine the logic gate circuit, we need to analyze the given voltage waveforms for inputs A, B, and output Y:
Fig. Logic gate circuit
From the waveform:
- Observe when both inputs A and B are high (1), the output Y is also high (1).
- When either A or B is low (0), the output Y is low (0).
This behavior is consistent with an AND gate, which outputs high only when all its inputs are high.
Verification Against Options:
- AND gate: Matches the observed behavior (correct).
- OR gate: Would output high if any input is high (does not match).
- NOR gate: Inverse of OR gate, would output low if any input is high (does not match).
- NAND gate: Inverse of AND gate, would output low only if all inputs are high (does not match).
Therefore, the logic gate circuit is indeed an AND gate.
Approach Solution -2
The correct answer is (A) : AND gate
On the basis of given graph, following table is possible.
| A | B | C |
| 0 | 0 | 0 |
| 1 | 1 | 1 |
| 0 | 1 | 0 |
| 1 | 0 | 0 |
From waveforms and above table, it is an AND gate.
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Concepts Used:
Logic Gates
AND Gate
It is the gate, where a circuit performs an AND operation. It has n number of input where (n >= 2) and one output.
OR Gate
It is the gate, where a circuit performs an OR operation. It has n number of input where (n >= 2) and one output.
NOT Gate
An inverter is also called NOT Gate. It has one input and one output where the input is A and the output is Y.
NAND Gate
A NAND operation is also called a NOT-AND operation. It has n number of input where (n >= 2) and one output.
NOR Gate
A NOR operation is also called a NOT-OR operation. It has n number of input where (n >= 2) and one output.
XOR Gate
XOR or Ex-OR gate is a specific type of gate that can be used in the half adder, full adder, and subtractor.
XNOR Gate
XNOR gate is a specific type of gate, which can be used in the half adder, full adder, and subtractor. The exclusive-NOR gate is flattened as an EX-NOR gate or sometimes as an X-NOR gate. It has n number of input (n >= 2) and one output.