TAILIEUCHUNG - Lecture Electrical Engineering: Lecture 9 - Dr. Nasim Zafar

The simplest and most fundamental nonlinear circuit element is the diode. Just like a resistor, the diode has two terminals; but unlike the resistor , which has a linear (straight-line) relationship between the current flowing through it and the voltage appearing across it, the diode has a nonlinear i-v characteristic. In this chapter, you will learn about: The ideal diode, terminal characteristics of junction diodes, modeling the diode forward characteristics, load line analysis. | Dr. Nasim Zafar Electronics 1 EEE 231 – BS Electrical Engineering Fall Semester – 2012 COMSATS Institute of Information Technology Virtual campus Islamabad The Diode Circuits: Lecture No: 9 Contents: Introduction. The Ideal Diode. Terminal Characteristics of Junction Diodes. Modeling the Diode Forward Characteristics. Load Line Analysis 2 Dr. Nasim Zafar 3 References: Microelectronic Circuits: Adel S. Sedra and Kenneth C. Smith. Electronic Devices and Circuit Theory: Robert Boylestad & Louis Nashelsky ( Prentice Hall ) Electronic Devices : Thomas L. Floyd ( Prentice Hall ) Dr. Nasim Zafar Introduction: The simplest and most fundamental nonlinear circuit element is the diode. Just like a resistor, the diode has two terminals; but unlike the resistor , which has a linear (straight-line) relationship between the current flowing through it and the voltage appearing across it, the diode has a nonlinear i-v characteristic. Let us discuss an ideal diode in order to understand the essence of the diode function. We can then study the real silicon p-n junction diode and explain its current-voltage characteristics. 4 Dr. Nasim Zafar Introduction: Applications of the Diode: One of the important application of a diode is their use in the design of the rectifiers, which converts an ac signal into a dc signal. We will also briefly discuss some other specialized diodes such as the light emitting diodes LED’s and photodiodes. 5 Dr. Nasim Zafar Diode Equation and Models: In this lecture we will discuss some models for the operation and design of the diode to explain diode characteristics. We can use these models instead of the diode equation in circuit analysis. Later on, we will be developing similar models (or equivalent circuits) to represent the behaviour of transistors when they are used as linear amplifiers. 6 Dr. Nasim Zafar Modeling The Diode: The Ideal Diode Model The Exponential Model Load Line Analysis Piecewise-Linear Model The Diode Models 1. The Ideal Diode Model

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