Chapter34_PN-Models

Chapter34_PN-Models - 3.4 PN Junction: Diode Models 3.4.1...

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3.4 PN Junction: Diode Models 3.4.1 Load-Line Analysis 3.4.2 Ideal Diode Model 3.4.3 Constant Voltage Drop Model 3.4.4 Breakdown Model Jaeger & Blalock, Chapter 3.10-3.12, page 96-112 Slides courtesy of Prof. Oliver Brand

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2 Diode Circuit Analysis Establish simple diode models to facilitate (dc) analysis of circuits containing diodes Example: Series circuit of voltage source, resistor and diode Note: V and R may represent Thévenin equivalent of more complicated two-terminal network Goal: Find quiescent operating point or Q-point of diode Jaeger, Blalock, Fig. 3.22 V = I D R + V D What are the values for V D and I D ?
3 3.4.1 Load-Line Analysis Load-Line Analysis = Graphical analysis if diode I-V characteristic is only available in graphical form Analysis approach: Write load-line equation Plot load-line and diode I-V characteristic Q-point is defined by intersection of load line and diode I-V characteristic Jaeger, Blalock, Fig. 3.23 V = I D R + V D 10 = I D 10 4 + V D I D = 10 4 V D + 10 3 V=10 V R = 10 4 Ω Q-point = (0.95mA, 0.55V)

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4 Load-Line Analysis – The Mathematical Approach – Goal: Find intersection of load line and diode I-V characteristic using mathematical software package Given are R = 10 4 Ω , V = 10 V, I S = 10 -13 A and kT/q = 0.026 V, unknown are V
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This note was uploaded on 10/12/2011 for the course ECE 3040 taught by Professor Hamblen during the Fall '07 term at Georgia Institute of Technology.

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Chapter34_PN-Models - 3.4 PN Junction: Diode Models 3.4.1...

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