TAILIEUCHUNG - Lecture Electrical Engineering: Lecture 15 - Dr. Nasim Zafar

In this chapter, you will learn about: Transistor characteristics and parameters, the gain factors: DC Beta and DC alpha, relationship of DC Beta and DC alpha, early effect, maximum transistor ratings. | Dr. Nasim Zafar Electronics 1 EEE 231 – BS Electrical Engineering Fall Semester – 2012 COMSATS Institute of Information Technology Virtual campus Islamabad BJT-Transistor Characteristics and Parameters: Lecture No: 15 Contents: Transistor Characteristics and Parameters. The Gain Factors: DC Beta( ) and DC Alpha ( ). Relationship of and . Early Effect. Maximum Transistor Ratings. 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. 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 Characteristics and Hybrid Parameters 7 Nasim Zafar An Overview of Bipolar Transistors: While control in an 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 Characteristics: Transistor Geometry. Carrier motion (mobility). Collector “collection efficiency” (Alpha). Asymmetry: Efficiency / Breakdown voltages. NPN transistors are normally better than PNP since electron mobility is better than hole mobility. 9 Nasim Zafar Transistor Biasing Configurations and Operation Modes: 10 Nasim Zafar Transistor Biasing Configurations: Common-Base Configuration (CB) : input = VEB & IE ; output = VCB & IC 2. Common-Emitter Configuration

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