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The V to I characteristic of a silicon diode is shown in the figure. Calculate the resistance of the diode at (a) I_(D)=15mA and (b) V_(D)=-10V. |
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Answer» Solution :Considering the diode characteristics as a straight line betweenI = 10 mA to I = 20 mA passing through the origin, we can calculate the resistance USING Ohm.s law. (a) From the curve, at `I_(2)=20mA` for `V_(2)=0.8V, I_(1)=10mA` for `V_(1)=0.7V` `therefore` Resistance of forward bias, `r_(fb)=(DeltaV)/(DeltaI)` `therefore r_(fb)=(V_(2)-V_(1))/(I_(2)-I_(1))` `=(0.8-0.7)/((20-10)xx10^(-3))=(0.1XX10^(3))/(10)` `therefore r_(fb)=10Omega` (b) From the curve at `V=-10V, I=-1muA` `therefore` Resistance of reverse bias, `r_(rb)=(V)/(I)` `therefore r_(rb)=(-10)/(-1xx10^(-6))` `=1xx10^(7)Omega` |
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