Two p-n junction diodes 
and 
are connected as shown in figure. 
and 
are input signals and 
is the output. The given circuit will function as a 
.
Text Solution
Verified by ExpertsD
If 
and 
: Both diodes are forward biased. The potential at C is pulled down to approximately 0 V (logic 0 ).
If 
and 
: Diode 
is forward biased, pulling the potential at C down to 0 V (logic 0 ). Diode 
is reverse biased.
If 
and 
: Diode 
is forward biased, pulling the potential at C down to 0 V (logic 0 ). Diode 
is reverse biased.|
If 
and 
: Both diodes are reverse biased. No current flows through the resistor R , so the potential at C remains at 
(logic 1).
The truth table is:
0 | 0 | 0 |
0 | 1 | 0 |
1 | 0 | 0 |
1 | 1 | 1 |
This truth table corresponds to the AND gate logic operation 
.
Therefore, the circuit functions as an AND gate.
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