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A logic circuit has two inputs A and B. The output is 1 only when A is 0 and B is 1. Which gate is this?
AND
OR
NAND
INHIBIT (OR with NOT on A)
INHIBIT (OR with NOT on A)
An Inhibit gate, also known as the B-AND-NOT-A gate, produces a logic high output only when the specific control input (A) is at a logic 0 state and the data input (B) is at a logic 1 state. This effectively masks or 'inhibits' the signal B if A is high.
IEEE Std 91-1984
An Inhibit gate, also known as the B-AND-NOT-A gate, produces a logic high output only when the specific control input (A) is at a logic 0 state and the data input (B) is at a logic 1 state. This effectively masks or 'inhibits' the signal B if A is high.
Y=AтЛЕB тАФ Output expression for the inhibit gate
The logic operation is represented as Y=AтЛЕB. When A=0, A=1, allowing the signal B to pass through. When A=1, A=0, forcing the output to 0 regardless of B.
The inhibit gate is a combination of a NOT gate on input A and an AND gate.
It is primarily used in digital systems for conditional signal gating or masking.
The truth table results in 1 only for the input pair (A,B)=(0,1).
Useful for selective signal gating
Simplifies combinatorial logic circuits compared to discrete implementations
Not a standard primary gate like NAND or NOR
Requires additional inversion logic
Digital signal processing
Interrupt masking in computer architecture
Option A (AND) output is 1 only when A=1,B=1.
Option B (OR) output is 1 when A=1 or B=1.
Option C (NAND) output is 0 only when A=1,B=1.
D is correct тАФ The operation Y=AтЛЕB describes the inhibit gate behavior where A acts as an active-low enable or inhibitory control.
Always verify the truth table for input pairs in logic gate questions; remember that for an inhibit gate, the 'inhibit' input (A) must be inverted before the AND operation.
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