TAILIEUCHUNG - Lecture Electrical Engineering: Lecture 13 - Dr. Nasim Zafar

In this chapter, you will learn about: To study the basic structure of the Bipolar Junction Transistor (BJT) and to determine its operating characteristics, one of the important objective of this topic is to gain an understanding of the mechanism of the current flow and the transistor operation, to analyze the properties of the transistor with proper biasing for an amplifier circuit, to relate the properties of the device to certain circuit parameters. | Dr. Nasim Zafar Electronics 1 EEE 231 – BS Electrical Engineering Fall Semester – 2012 COMSATS Institute of Information Technology Virtual campus Islamabad Bipolar Junction Transistors Lecture No: 13 Contents: Introduction Basic Transistor Operation Transistor Biasing Configurations Transistor Currents Transistor Characteristics and Parameter Reference: Chapter 4 – Bipolar Junction Transistor: Figures are redrawn (with some modifications) from Electronic Devices By Thomas L. Floyd Bipolar Junction Transistors BJTs-Device B C E Objectives: To study the basic structure of the Bipolar Junction Transistor (BJT) and to determine its operating characteristics. One of the important objective of this topic is to gain an understanding of the mechanism of the current flow and the transistor operation. To analyze the properties of the transistor with proper biasing for an Amplifier Circuit. To relate the properties of the device to certain circuit parameters. BJT- an Introduction: The basis of electronic systems now a days is a semiconductor device. The famous and commonly used device is BJTs (Bipolar Junction Transistors). Invented in 1948 by Bardeen, Brattain and Shockley. Two kinds of BPJ transistors: npn and pnp BJT- an Introduction: A bipolar junction transistor consists of three adjoining, alternately doped, regions of semiconductors. emitter : E base: B collector : C The middle region of the transistor, base B, is very thin compared to the diffusion length of the minority carriers. BJT- an Introduction: In “normal operation” of a PNP transistor, positive voltage is applied to the emitter and negative voltage to the collector. A small current in the base region can be used to control a larger current flowing between the emitter and the collector regions. The device can be characterized as a current amplifier, having many applications for amplification and switching. BJT- an Introduction: Transistors as an Amplifier for the base current, since small changes

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