Question

Following logic circuit is equivalent to

Answer 1

The correct option is 2 OR gate

• If A= 0 and B= 0, then both diodes D1 and D2 are reverse biased and thus both the diodes are in cut-off and thus F is low.
• If A= 0 and B= 1, D1 is reverse biased, thus does not conduct. But D2 is forward biased, thus conducts and thus pulling F to HIGH.
• If A= 1 and B= 0, D2 is reverse biased, thus does not conduct. But D1 is forward biased, thus conducts and thus pulling F to HIGH.
• If A = 1 and B = 1, then both diodes D1 and D2 are forward biased and thus both the diodes conduct and thus F is HIGH.

A	B	F(A, B)
0	0	0
0	1	1
1	0	1
1	1	1

Comments

thanks for answering but answer 1) AND is given in the answer key