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  • Write the truth table for the circuits given in Fig. 14.40 consisting of NOR gates only. Identify the logic operations (OR, AND, NOT) performed by the two circuits.

Q. 14.15     Write the truth table for the circuits given in Fig. 14.40 consisting of NOR gates only. Identify the logic operations (OR, AND, NOT) performed by the two circuits.

                                

                                                                Figure 14.40

Answers (1)

best_answer

a)

A is the two input of the NOR gate and Hence Output Y is:

                                                     Y =   \overline {A+A}

                                                     Y = \overline {A}

Hence circuit functions as a NOT gate.

TRUTH TABLE:

INPUT OUTPUT
0 1
1 0

b) A is the two input of a NOR gate whose output(which is \overline {A})  is the one input of another NOR gate. B is the two input of NOR gate whose output (which is \overline {B})  is the input of another NOR gate. Hence, 

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

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

     Y = A.B

Hence it functions as AND gate.

TRUTH TABLE:

INPUTS OUTPUT
00 0
01 0
10 0
11 1

 

Posted by

Pankaj Sanodiya

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