Lecture17-BJT QualitativeAndPerformParam

Lecture17-BJT QualitativeAndPerformParam - ECE 3040 Dr Alan...

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Unformatted text preview: ECE 3040 - Dr. Alan Doolittle Georgia Tech Lecture 17 Bipolar Junction Transistors (BJT): Part 1 Qualitative Understanding - How do they work? Reading: Pierret 10.1-10.6, 11.1 ECE 3040 - Dr. Alan Doolittle Georgia Tech Bipolar Junction Transistor Fundamentals Voltage Nomenclature Standard V +- npn mnemonic: “Not Pouring ‘N’ ” pnp mnemonic: “Pouring ‘N’ Pot” Looks sort of like two diodes back to back ECE 3040 - Dr. Alan Doolittle Georgia Tech Bipolar Junction Transistor Fundamentals Emitter “emits” holes Narrow Base controls number of holes emitted Collector “collects” holes emitted by the emitter Emitter “emits” electrons Narrow Base controls number of electrons emitted Collector “collects” electrons emitted by the emitter ECE 3040 - Dr. Alan Doolittle Georgia Tech Bipolar Junction Transistor Fundamentals = + + + = CE BC EB C B E V V V I I I ECE 3040 - Dr. Alan Doolittle Georgia Tech Bipolar Junction Transistor Fundamentals Both the input and output share the base “in common” Both the input and output share the emitter “in common” Both the input and output share the Collector “in common” ECE 3040 - Dr. Alan Doolittle Georgia Tech Bipolar Junction Transistor Fundamentals •Active: Is useful for amplifiers. Most common mode •Saturation: Equivalent to an on state when transistor is used as a switch •Cutoff : Equivalent to an off state when transistor is used as a switch •Inverted: Rarely if ever used. ECE 3040 - Dr. Alan DoolittleECE 3040 - Dr....
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This note was uploaded on 08/23/2011 for the course ECE 3040 taught by Professor Doolittle during the Spring '11 term at University of Florida.

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Lecture17-BJT QualitativeAndPerformParam - ECE 3040 Dr Alan...

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