If 
and 
are the input voltages (either 5V or 0V) and 
is the output voltage then the two gates represented in the following circuit
OR and NOT Gate
Text Solution
Verified by ExpertsB
V A = 5 V 
A = 1
V A = 0 V 
A = 0
V B = 5 V 
B = 1
V B = 0 V 
B = 0
If A = B = 0, there is no potential anywhere here V 0 = 0
If A = 1,B = 0, Diode D 1 is forward biased, here V 0 = 5 V
If A=1, B =1, Diode D 2 is forward biased hence V 0 = 5V
If A=1, B =1, Both diodes are forward biased hence V 0 = 5V
Truth table for IstA | B | Output |
0 | 0 | 0 |
0 | 1 | 1 |
1 | 0 | 1 |
1 | 1 | 1 |
∴ Given circuit is OR gate
For II
nd circuit
V B = 5 V, A = 1
V B = 0 V, A = 0
When A = 0,E – B junctions is unbiased there is no current through it
∴ V 0 = 1
When A = 1,E – B junction is forward biased
V 0 = 0
Hence this circuit is not gate.
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