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The V-I characteristic of a silicon diode is shown in the figure . Calculate the resistance of the diode at (a) I_(D) = 15 mA and (b) V_(D) = -10 V |
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Answer» Solution :Considering the diode characteristics as a straight line between `I = 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 = 20 mA , V = 0.8 V , I = 10 mA , V = 0.7 V `r_(fb) = (DELTAV)/(DELTAI) = (0.1)/(10) = 10 Omega` b. From the curve at `V = -10V , I = -1 mu A` `therefore r_(fb) = (10)/(1 mu) = 1.0 xx 10^(7) Omega` |
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