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  • Write the truth table for circuit given in Fig. 14 .39 below consisting of NOR gates and identify the logic operation (OR, AND ,NOT) which this circuit is performing.

Q. 14.14  Write the truth table for the circuit given in Fig. 14.39 below consisting of NOR gates and identify the logic operation (OR, AND, NOT) that this circuit is performing.

(Hint:  A=0,B=1  then A and  in the end puts of second NOR gate will be 0 and hence Y=1. Similarly work out the values of  Y for other combinations of A and B. Compare with the truth table of OR, AND, NOT gates and find the correct one.)

Answers (1)

best_answer

A and B are the input of a NOR gate and the Output of this NOR gate is the Input of another NOR gate whose Output is Y. Hence,

                                                                Y =    \over(\overline{A+B} + \overline{A+B})

                                                                Y =     \over\overline {A+B} .  \over\overline {A+B}

                                                                 Y =  A + B 

Hence Circuit behaves as an OR gate.

Truth table

INPUTS OUTPUT
00 0
01 1
10 1
11 1
Posted by

Pankaj Sanodiya

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