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Unformatted text preview: PN Junction Topics PN Junction Models Reading Assignment Sedra and Smith Chap 3 Howe Chap 3, Howe Chap 6 Lecture 10 • 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. I D V D0 I V D D r 1 V D V D0 3dB 3k B T semiideal 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 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 ) IV curve Diode Models Ideal diode model Actual characteristic Piecewise linear model Constant voltage model Other diode models Small Signal model...
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This note was uploaded on 09/16/2007 for the course ECE 3150 taught by Professor Spencer during the Spring '07 term at Cornell.
 Spring '07
 SPENCER
 Microelectronics, small signal, qV, small signal model, qV exp kT, Dn exp kT

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