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  • (a) Write the truth table for the combination of the gates shown in the figure.             <img alt="" src="https://cdn.entrance360.com/media/uploads/2020/04/05/16.PNG" style="heigh

(a) Write the truth table for the combination of the gates shown in the figure.

            

(b) Explain briefly how a photodiode operates.

 

 

 

 
 
 
 
 

Answers (1)

(a)

A B \bar{A} \bar{B} C
0 0 1 1 0
0 1 1 0 0
1 0 0 1 0
1 1 0 0 1

(b) Photodiode -

 \rightarrow The photodiode is a special purpose Pn junction diode operated under reverse bias

\rightarrow When a photon of energy h\nu > energy gap of the semiconductor falls on the photodiode electron-hole pairs are generated.

\rightarrow Due to the electric field at the junction, the electrons and holes are separated before they combine.

\rightarrow Electrons are moved to n side and holes are moved to the P side.

\rightarrow Now a potential difference is created, when connected to external load a current flows.

\rightarrow The magnitude of photocurrent depends on the intensity of incident light.

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Safeer PP

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