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Q#1
Combinational Circuits
GATE EE 1998
MCQ
+2 marks
-0.66 marks
In a digital combinational circuit with 4 inputs (A, B, C, D), it is required to obtain an output of logical 1 only for the input combination (A=1; B=C=D=0). It is known that the following combinations of input are forbidden:
ABCD= 1010, 1011, 1100, 1101, 1110, 1111
Evaluate the logical expression for the output and realize the same with two input NAND gates. Assume that complements of inputs are not available.
None
Explanation:
Output is 1 for input combination (A=1; B=C=D=0) i.e. 1000 and 1110, but 1110 is forbidden so only for input combination 1000 output is 1.
Realization of output using NAND Gates
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