Solve the problems in Example 3.2 using the constant-voltage-drop (VD = 0.7 V) d

Question

Solve the problems in Example 3.2 using the constant-voltage-drop (VD = 0.7 V) diode model. Assuming the diodes to be ideal, find the values of l and V in the circuits of Fig. 3.6.

Explanation / Answer

a) assuming D1 and D2 diodes are in forward bias =>10-10Id-.7-(I+Id)5=-10 =>20-.7=15id+5i =>19.3=15Id+5i-------1=>3Id+i=3.86 0-.7-(i+id)5=-10 =>10-.7=(i+id)5 =>i+id=1.86 mA------2 solving 1 and 2 we get =>Id=1mA I=.86mA 10-10id=V =>V=0V b)assuming both D1 and D2 are in forward bias we get 20-.7-5Id-10(i+id)=0 =>19.3=10i+15id =>3id+2i=3.86-----(1) -.7=10(i+id)-10 =>i+id=.93------(2) solving 1 and 2 we get id=2mA i=negative which is not possible as D2 is forward biased so make D2 as reverse biased 20-.7=15id =>id=1.287mA V=10-5*1.287=3.565V

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