Lecture 3_ Jan 14 2011 - Chapter 3 Solid-State Diodes and...

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Unformatted text preview: Chapter 3 Solid-State Diodes and Diode Circuits Lecture 3 Cover sections: 3.10, 3.11 Diode Circuit Analysis: Basics V and R may represent the Thvenin equivalent of a more complex 2- terminal network. The objective of diode circuit analysis is to find the quiescent operating point for the diode. Q-Point = (I D , V D ) The loop equation for the diode circuit is: This is also called the load line for the diode. The solution to this equation can be found by: 1.Graphical analysis using the load-line method. 2.Analysis with the diodes mathematical model. 3.Simplified analysis with the ideal diode model. 4.Simplified analysis using the constant voltage drop (CVD) model. D D V R I V + = Chap 3.10 Load-Line Analysis (Example) Problem: Find diode Q-point Given data: V = 10 V, R = 10k . Analysis: To define the load line we use, These points and the resulting load line are plotted.Q-point is given by intersection of load line and diode characteristic: Q-point = (0.95 mA, 0.6 V) 10 10 4 D D V I + = Chap 3.10 For V D = 0, I D = 10 V 10 k ( 29 = 1 mA For V D = 5 V , I D = 5 V 10 k ( 29 = 0.5 mA Analysis using Mathematical Model for...
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This note was uploaded on 03/06/2011 for the course ECE 255 taught by Professor Staff during the Spring '08 term at Purdue University-West Lafayette.

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Lecture 3_ Jan 14 2011 - Chapter 3 Solid-State Diodes and...

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