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 1 of 3.
Vicky said:
7 years ago
The actual configuration is for Positive logic (i,e logic 1= Vr and logic 0 = 0) AND gate, BUT since the logic has been changed to negative logic (i, e logic 1= 0, and logic 0= Vr), so instead of AND gate it will be OR gate. So, it is a Negative Logic OR gate.
(4)
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.
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.
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.
Ravi shankar kumar said:
1 decade ago
Since V (1) is lower state than V (0) it is a negative logic circuit. Here diode is not adding at the junction but away from the junction. So it is negative logic AND Gate.
(1)
Badhshah said:
8 years ago
That is the diodes are connected in the reverse direction that is for 0 it is ON for diode it is forward biased when negative pulse is applied.
(1)
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.
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.
TARUN UPADHYAY said:
5 years ago
It is -ve because 0 volts is shown as a logic high, and 1 volt is shown by logic low.
(2)
Parl said:
9 years ago
It is -ve because 0 volts is shown as a logic high, and 1 volt is shown by logic low.
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