Problem 61-4    Source:   Example 1.7 - page 29 - NEAMEN, Donald A. - Book: Microelectronics, Circuit Analysis and Design - 4ª Ed. - McGraw-Hill - 2010.

A silicon diode has an inverse saturation current I_o = 2 x 10^-14 A. Determine the voltage V_D forward bias required to produce a current I_D equal to 50 µA and 1 mA.

Solution of the Problem 61-4   

From the problem statement, it is known that I_o = 2 x 10^-14 A, I_D = 50 µA e V_T = 25 mV. As the value of η was not provided, we will assume a unit value. So, manipulating the eq. 61-4, we will find:

Substituting for the numerical values, we get:

And when I_D = 1 mA, we get: