TAILIEUCHUNG - Lecture Electrical Engineering: Lecture 14 - Dr. Nasim Zafar

In this chapter, you will learn about: Introduction, bipolar transistor currents, bipolar transistor characteristics and parameter, early effect, microelectronic circuits, electronic devices, integrated electronics, electronic devices and circuit theory,. | Dr. Nasim Zafar Electronics 1 EEE 231 – BS Electrical Engineering Fall Semester – 2012 COMSATS Institute of Information Technology Virtual campus Islamabad 1 Bipolar Junction Transistors-BJTs Lecture No: 14 Contents: Introduction Bipolar Transistor Currents Bipolar Transistor Characteristics and Parameter Early Effect 2 Nasim Zafar. References: Microelectronic Circuits: Adel S. Sedra and Kenneth C. Smith. Electronic Devices : Thomas L. Floyd ( Prentice Hall ). Integrated Electronics Jacob Millman and Christos Halkias (McGraw-Hill). Electronic Devices and Circuit Theory: Robert Boylestad & Louis Nashelsky ( Prentice Hall ). Introductory Electronic Devices and Circuits: Robert T. Paynter. 3 Nasim Zafar. Reference: Chapter 4 – Bipolar Junction Transistors: Figures are redrawn (with some modifications) from Electronic Devices By Thomas L. Floyd 4 Nasim Zafar. Bipolar Junction Transistors BJTs-Circuits B C E 5 Nasim Zafar. Transistor Types MOS - Metal Oxide Semiconductor FET - Field Effect Transistor BJT - Bipolar Junction Transistor ◄ 6 Nasim Zafar. Transistor Current Characteristics 7 Nasim Zafar. An Overview of Bipolar Transistors: While control in a FET is due to an electric field. Control in a bipolar transistor is generally considered to be due to an electric current. current into one terminal determines the current between two others as with an FET, a bipolar transistor can be used as a ‘control device’ 8 Nasim Zafar. Transistor Biasing Configurations: Common-Base Configuration (CB) : input = VEB & IE ; output = VCB & IC 2. Common-Emitter Configuration (CE): input = VBE & IB ; output = VCE & IC Common-Collector Configuration (CC): input = VBC & IB ; output = VEC & IE 9 Nasim Zafar. Operation Modes: Active: Most importance mode, . for amplifier operation. The region where current curves are practically flat. Saturation: Barrier potential of the junctions cancel each other out causing a virtual short. Ideal transistor behaves like a closed switch.

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