A semiconductor diode has the following parameters: Is = 4.0×10-13 Amps, n = 1.35, and is operated at a temperature of T = 270K. (a) Find the value of the thermal voltage VT. (b) What is the diode current I when the diode voltage is V = 0.6V? (c) What is the diode voltage when the current is I = 20 mA?

Explanation:

Let's use Shockley ideal diode equation which relates the current intensity and the potential difference:

Where:

Thermal voltage at any temperature it is a known constant defined by:

Where:

(a)

Using the data provided:

(b)

Using the data provided and Shockley ideal diode equation

(c) Let's isolate from Shockley ideal diode equation:

Finally, using the data provided:

answer:

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