Question

Two identical diodes having io=0.1 microampere, VT=25mV and n=2 are connected as shown in the figure. The externally connected voltage is 15 volts and RL=100K. What is the voltage across the voltage D2?​

Answer 1

Answer:

A positive voltage means the diode is forward biased. A negative voltage means the diode is operating with reverse bias.First, assume no forward voltage drop and calculate Va. From Va, calculate the current through the diode : I'd = (Va - 0.7) / 4.7k. Once you have that, you can calculate the diodes equivalent resistance as 0.7 / Id. You can the revise that branch's equivalent resistance.

Explanation:

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Answer 2

Answer:

First, assume no forward voltage drop and calculate Va. From Va, calculate the current through the diode : I'd = (Va - 0.7) / 4.7k. Once you have that, you can calculate the diodes equivalent resistance as 0.7 / Id. You can the revise that branch's equivalent resistance.