Example A Junction Diode Circuit

Example A Junction Diode Circuit - 8/22/2005 Example A...

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8/22/2005 Example A Junction Diode Circuit empty.doc 1/3 Jim Stiles The Univ. of Kansas Dept. of EECS Example: A Junction Diode Circuit Consider the following circuit with two junction diodes: The diodes are identical, with n = 1 and I S = 10 -14 A. Q: If the current through the resistor is 6.5 mA, what is the voltage of source V S ?? A: This is a difficult problem to solve ! Certainly, we cannot just write: = V and then the answer. Instead, let’s just determine what we can , and see what happens ! D i 2 + v 2 1 +− 1 + - + R V S 6.5 mA 100
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8/22/2005 Example A Junction Diode Circuit empty.doc 2/3 Jim Stiles The Univ. of Kansas Dept. of EECS 1) If 6.5 mA flows through a 0.1 K resistor, the voltage across that resistor is: R v = 2) If the voltage across the resistor is 0.65 V, then the voltage across the diode D 2 , which is parallel to the resistor, is the same value: 2 D = 3) If we know the voltage across a p-n junction diode, then we also know its current ! ⎡⎤ ==
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Example A Junction Diode Circuit - 8/22/2005 Example A...

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