lecture_10 - Lecture 10 PN Junction Topics PN Junction...

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PN Junction Topics PN Junction Models Reading Assignment Sedra and Smith Chap 3 Howe Chap 3, Howe Chap 6 Lecture 10
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We have now derived the basic operation of the PN junction in forward and reverse bias We will now develop a small signal model which can be used in Spice to simulate the behavior of the device in a circuit. We will also address some issues of large signal behavior. Large signal models will not be dealt with extensively in this course and often have to be developed to address specific applications.
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I D V D0 - I 0 V D D r 1 V D V D0 3dB 3k B T semi-ideal exponential: steepest slope in log artifact from a sinh instead of an exponential function V BR almost linear, controlled by r D - = - + = 1 exp 1 exp 0 2 kT qV kT qV p D p n a n i T I I L N D L N D qn J log (I/I 0 ) I-V curve
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Diode Models Ideal diode model
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Actual characteristic Piecewise linear model Constant voltage model Other diode models
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Small Signal model kT qv D kT qv kT qV D kT v V q
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