Electronics and Communication Engineering - Digital Electronics - Discussion
Discussion Forum : Digital Electronics - Section 1 (Q.No. 13)
13.
The circuit in the given figure is
Answer: Option
Explanation:
Since V(I) is lower state than V(0) it is a negative logic circuit. Since diodes are in reversed parallel, it is an AND gate.
Note: In Boolean algebra it is recognized that a positive logic OR is a negative logic AND. Similarly a positive logic AND is a negative logic OR.
Discussion:
29 comments Page 2 of 3.
Badhshah said:
8 years ago
But if the single diode is forward biased then we are getting the output.
i.e. It's an OR gate and the input is a negative(0).
We know that for OR gate if one input is 1 then the output is 1.
So, the answer is -ve logic OR gate.
i.e. It's an OR gate and the input is a negative(0).
We know that for OR gate if one input is 1 then the output is 1.
So, the answer is -ve logic OR gate.
Nabanita said:
8 years ago
It is neg logic or gate as the diode is reverse biased it follows the following table:
0 0 = 0 (as the current flows to both of the diode the v0 output is zero)
0 1 = 0
1 0 = 0
1 1 = 1
it is pos logic and gate.
so it is neg logic or.
0 0 = 0 (as the current flows to both of the diode the v0 output is zero)
0 1 = 0
1 0 = 0
1 1 = 1
it is pos logic and gate.
so it is neg logic or.
Ayush Kumar said:
8 years ago
Why are you confused friends?
The right answer is negative logic AND gate because diode is reversed.
The right answer is negative logic AND gate because diode is reversed.
Arnab said:
8 years ago
It is only positive logic AND gate.
Tamil said:
8 years ago
@Lavanya.
The pulse is low to high so this is negative and the diodes are reversed. So this is negative logic AND gate. Suppose the diodes are forward this logic is negative logic OR gate.
The pulse is low to high so this is negative and the diodes are reversed. So this is negative logic AND gate. Suppose the diodes are forward this logic is negative logic OR gate.
Lavanya said:
8 years ago
Which is the correct answer and how? Please explain it clearly.
Can said:
1 decade ago
Since V(1) is lower state than V(0) it is a negative logic circuit. Since diodes are in parallel, it is an OR gate.
Chand said:
8 years ago
Positive logic AND, Negative logic OR both.
Mohd Salim said:
8 years ago
It should be a Negative logic AND gate.
Pranab said:
8 years ago
It is -ve logic OR gate and it is also +ve logic AND gate.
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