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What will be the current I in the circuit diagram below. Take terminal voltage of diode as 0.7V and I0as 10^-12A.(a) 2.4mA(b) 0.9mA(c) 1mA(d) 4mAThis question was addressed to me by my college director while I was bunking the class.Origin of the question is Characteristic Equation of Diode-1 in portion Diode Circuit of Analog Circuits

Answer»

Correct choice is (a) 2.4mA

The best explanation: Let VD be the VOLTAGE of diode, then by Kirchoff’s loop rule

3V = VD + IR1

This method of assumption contains small ERROR but it is the simplest method.

Let VD be 0.7V. Now the CURRENT I = (3-0.7)/1k = 2.3mA. Now the diode voltage for 2.3mA

VD = VT ln⁡(I/I^0) = 0.026 X ln((2.3×10^(-3))/10^(-12)) = 0.5864V.

Now the current becomes (3-0.5864)/1000 = 2.41mA.


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