Two signal A and B shown in the Fig. are used as two inputs of a NAND gate. Draw its output wave form. Give the logic symbol of NAND gate.

Explanation

For AND gate, output `y=A.B` and for NAND gate `y_(1)=bar(A.B)`.
For time less than 1, `A=0, B=1, y=0, y_(1)=1`
For time 1 to 2, `A=1, B=1, y=1, y_(1)=0`
For time 2 to 3, `A=1, B=0, y=0, y_(1)=1`
For time 3 to 4, `A=0, B=0, y=0, y_(1)=1`
For time 4 to 5, `A=0, B=0, y=0, y_(1)=1`
For time 5 to 6, `A=1, B=1, y=1, y_(1)=0`
For time 6 to 7, `A=0, B=0, y=0, y_(1)=1`
For time 7 to 8, `A=0, B=1, y=0, y_(1)=1`