GATE EC 2016 Set 3 — Question 27
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Digital Circuits → Combinational Logic → Static CMOS Logic Gates
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Question
The logic functionality realized by the circuit shown below is
Correct answer
(D) AND
Solution
The given circuit consists of two NMOS transistors acting as pass transistors.
This corresponds to the logical AND operation.
1.Top Transistor: Its gate is connected to , drain to , and source to . It is ON when .
2.Bottom Transistor: Its gate is connected to , drain to , and source to ground (). It is ON when (i.e., ).
Let's analyze the output for different values of :- If : The top transistor is ON and the bottom transistor is OFF. The output is connected to . Thus, .
- If : The top transistor is OFF and the bottom transistor is ON. The output is connected to ground. Thus, .
This corresponds to the logical AND operation.
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