GATE EE 2017 Set 1 — Question 37
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Analog & Digital Electronics → Digital Logic Circuits → Boolean Algebra & Gates
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Question
The logical gate implemented using the circuit shown below where, and are inputs (with as digital and as digital ) and is the output, is
Correct answer
(B) NOR
Solution
In the given circuit, the collectors of transistors and are connected together to the output . This is a wired-OR configuration followed by inversion.
This corresponds to a NOR gate.
1.If (High), is in saturation and acts as a closed switch, pulling to ground ().
2.If (High), is in saturation and acts as a closed switch, pulling to ground ().
3. is high () only when both and are OFF, which happens when and .
The truth table is:| 0 | 0 | 1 |
| 0 | 1 | 0 |
| 1 | 0 | 0 |
| 1 | 1 | 0 |
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