Question
Write the truth table for the circuit shown in Fig. Name the gate that the circuit resembles.

Answer

This is 'AND' Gate and its characteristics are as follows:
  1. It has tow inputs (A and B) and only one output (Y).
  1. Boolean expression is Y = A.B is read as "Y equals A AND B".
  2. Realization of AND gate
  1. A = 0, B = 0
The voltage supply throught R is forward biasing diodes $D_1$ and $D_2$ (offers low resistance), the voltage V would drop across R.
The output voltage at Y = the voltage across diode = 0.
  1. A = 0, B = 1
$D_1 =$ Conducts, $D_2 =$ Not Conducts
The out voltage at Y = The voltage across the diode $(D_1) = 0$
  1. A = 1, B = 1
$D_1 =$ Conducts, $D_2 =$ Not conducts
The out voltage at Y = The voltage across the diode $(D_2) = 0$
  1. A = 1, B = 1
None of the diode conducts
The out voltage ar Y = Battery voltage = 1
  1. Truth table for 'AND" gate
A B $V_0 = A.B$
0 0 0
0 1 0
1 0 0
1 1 1

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