# JEE Main & Advanced Physics Semiconducting Devices The 'OR' Gate

## The 'OR' Gate

Category : JEE Main & Advanced

(1) It has two inputs (A and B) and only one output (Y)

(2) Boolean expression is $Y=A+B$ and is read as "Y equals A OR B"

(3) Realization of OR gate

(i) $A=0,\,\,B=0$ Both diodes ${{D}_{1}}$ and ${{D}_{2}}$ do not conduct and hence $Y=0$

(ii) $A=0,\,B=1$ ${{D}_{1}}=$ Does not conducts, ${{D}_{2}}=$Conducts, hence $Y=1$

(iii) $A=1,\,B=0$ ${{D}_{1}}=$ Conducts, ${{D}_{2}}=$

Does not conduct, hence $Y=1$ (iv) $A=1,\,B=1$ Both ${{D}_{1}}$ and ${{D}_{2}}$ conducts, hence $Y=1$ (4) Truth table for 'OR' gate

 A B Y = A + B 0 0 0 0 1 1 1 0 1 1 1 1

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