question_answer 19)

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

Answer:

in fig. using Boolean algebra (De-Morgan theorem) this is a NOT operation. Therefore, fig. (i) represents a NOT gate. In fig. (ii) (De Morgan theorem) = A . B which is an AND operation. the fig. (ii) represents an AND gate.