TAILIEUCHUNG - Lecture Electrical Engineering: Lecture 17 - Dr. Nasim Zafar

In this chapter, you will learn about: Microelectronic circuits, electronic devices, integrated electronics, electronic devices and circuit theory, introductory electronic devices and circuits. | Dr. Nasim Zafar Electronics 1 - EEE 231 Fall Semester – 2012 COMSATS Institute of Information Technology Virtual campus Islamabad DC Analysis of Transistor Circuits-II Lecture No: 17 Contents: DC Current and Voltage Analysis. Examples and Exercises. 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. Lecture No. 17 DC Analysis of Transistor Circuits-II Reference: Chapter Microelectronic Circuits Adel S. Sedra and Kenneth C. Smith. DC Analysis of Transistor Circuits Basic Transistor Operation Consider this circuit as two separate circuits: The Base-Emitter Circuit The Collector-Emitter Circuit The amount of current flow in the base-emitter circuit controls the amount of current that flows in the collector circuit. Small changes in base-emitter current yields a large change in collector-current. 6 Fig 4-6a DC Analysis of Transistor Circuits Analysis of this transistor circuit to predict: DC Voltages and Currents requires use of : Ohm’s law, Kirchhoff’s voltage law and the ß for the transistor. 7 Fig 4-7 DC Analysis of Transistor Circuits Kirchhoff’s voltage law: In the Base Circuit: VBB is distributed across the base-emitter junction and RB In the collector circuit: We determine that VCC is distributed proportionally across RC and the transistor, VCE. 8 Fig 4-7 Transistor Characteristics and Parameters There are three dc voltages and three dc currents to be considered. IB: dc base current IE: dc emitter current IC: dc collector current VBE: dc voltage across base-emitter junction VCB: dc voltage across collector-base junction VCE: dc voltage from collector to emitter 9 Fig 4-7 BJT-Current and Voltage Analysis When the .

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