# Am I interpreting this basic diode question correctly?

I am doing a question related to diodes from Sedra Smith Micro electronics and here is the question snip:  In the second part of the question where it says that if 1mV is being drawn by a load attached to output terminal, so for this I do the following::: And for the value of 'I' I use the result that I get in the first part of the question which is 3.81mV. But the answer I am getting is not correct. The correct value of the output voltage in the second part is -22mV. My answer is not the same. Can someone guide me as to how to do this question thoroughly. Thanks in advance!

• You seem to be mixing up volts and amps. May 24, 2017 at 2:25
• I meant mA in the diagram. Changed it now. May 24, 2017 at 2:32
• How are you trying to do it, and what is your answer? I get -23mV-- and please fix the "3.81mV" in your question. May 24, 2017 at 2:51
• Watch out. The answer to part 1 is extremely sensitive to the exact value of Vt you use. You used Vt = 25 mV. However, if you use Vt = 25.25 mV, then the answer to part 1 is only 2.93 mA. Make sure you are using the same values in part 2 as part 1.
– Evan
May 24, 2017 at 3:07
• Assuming the emission coefficient is 1, then I get $V_T\approx 24.897023\:\textrm{mV}$ in order to get exactly $-22\:\textrm{mV}$ as the difference. To the OP: Are you going to show some of your work? Where did that $3.81\:\textrm{mV}$ come from, for example?
– jonk
May 24, 2017 at 4:40