Example Junction Diode Models

Example Junction Diode Models - 8/30/2005 Example Junction...

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8/30/2005 Example Junction Diode Models empty.doc 1/7 Jim Stiles The Univ. of Kansas Dept. of EECS Example: Junction Diode Models Consider the junction diode circuit, where the junction diode has device parameters I S = 10 -12 A, and n =1: Now, let’s determine approximate values using diode models ! First, let’s try the ideal diode model . D v + i 50 +5 V I numerically solved the resulting transcendental equation, and determined the exact solution: . . 87 40 0630 im A V = = + 50 +5 V + 50 +5 V
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8/30/2005 Example Junction Diode Models empty.doc 2/7 Jim Stiles The Univ. of Kansas Dept. of EECS We therefore can approximate the junction diode current as the current through the ideal diode model : = 100 mA i DD ii And approximate the junction diode voltage as the voltage across the ideal diode model : = 0 v Compare these approximations to the exact solutions: . 87 4 and 0.630 V im A == Close, but we can do better! Let’s use the CVD model . 0
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Example Junction Diode Models - 8/30/2005 Example Junction...

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