July09_Lesson_One - Key Lecture Concepts for CoE225/EE 271...

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v v v Resistor i i i Key Lecture Concepts for CoE225/EE 271 (Mostly Digital Electronics) Suggestions for Learning from the Lessons: The lessons are written so that you can learn by interactive discussions during the class and not be concerned about taking notes. Therefore the lesson overview and the bold statements should be read at least once before coming to class so that you are somewhat familiar with the subjects and can then learn better during the interactive discussions in class. This will reduce the time needed outside of class to master the topics to be tested on exams. Note that the sentences inserted between brackets ([---------]) in these lessons are not unimportant but can be left unread for continuity of reading comprehension of the key ideas that initially should be mastered before the important related details are learned. Bold statements normally have to be read several times from different viewpoints to obtain thorough understanding of the subjects they address. The statements in bold type concisely present the main ideas and can be used to review the important concepts in a lesson. LESSON 1 Two-Terminal Nonlinear Devices Introduction and Overview: This lesson has two important learning objectives. The first is to understand the meaning of the symbols and the nonlinear current versus voltage (I/V) characteristics for two-terminal electronic devices. In the first three weeks of this course you will learn how circuit engineers use nonlinear device characteristics to design circuits that can perform digital operations, e.g. NOR and AND. {Example linear and nonlinear device characteristics are sketched at the bottom of this page, along with dotted characteristics which model nonlinear characteristics using linear segments.} You also will learn how two terminal nonlinear devices, particularly a device called the diode, are used to design circuits which can amplify and change the shape of electrical analog signal waveforms. Analog, versus digital, signals vary continuously and relatively slowly with time, having all possible amplitude values. In contrast, digital signals ideally have two distinct values, except when switching between the two values. Waveforms of analog versus digital signals should be put in the margins as shown during the class discussion. The second learning objective is to understand how circuits with nonlinear devices can be analyzed by approximating regions of the nonlinear device I/V curve by linear (straight-line) characteristics. A battery and a resistor are used to model the straight-line characteristics for circuit analysis. See the bottom of Fig 1.2, pg 15. Note that a battery of 0.5 [v] and a resistor of ten ohms replaces the diode when it is conducting in the first quadrant. A circuit with a nonlinear diode, or diodes, can then be analyzed using linear circuit analysis as done in ECE 231. In the first three lessons, many example circuits with one or more diodes will be analyzed by
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This note was uploaded on 02/18/2010 for the course ECET 271 taught by Professor Hu during the Spring '05 term at NJIT.

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July09_Lesson_One - Key Lecture Concepts for CoE225/EE 271...

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