ecse 330 - Department of Electrical and Computer...

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Department of Electrical and Computer Engineering ECSE-330 Introduction to Electronics MODULE 2 Bipolar Junction Transistors BJTs 2.1 J. Schwartz Department of Electrical and Computer Engineering ECSE-330 Introduction to Electronics ection 1 Section 1 Introduction to the BJT Sedra/Smith, Sections 5.1, 5.2, 5.4, 5.5 BJTs 2.2 J. Schwartz Department of Electrical and Computer Engineering ECSE-330 Introduction to Electronics tline of Section 1 Outline of Section 1 1.1 Introduction to the Bipolar Junction Transistor 1.2 Active Mode Operation of the npn BJT 1.3 Active Mode Operation of the pnp BJT 4 DC Analysis of Active Mode BJT Circuits 1.4 DC Analysis of Active Mode BJT Circuits BJTs 2.3 J. Schwartz Department of Electrical and Computer Engineering ECSE-330 Introduction to Electronics ilding a Dependent So rce Building a Dependent Source ree rminal device is required to A three terminal device is required to implement current switches and amplifiers. – need voltage control terminal – used to control current flow through th t t i l other two terminals • All four ideal amplifier nfigurations (Module 1 Section 1) configurations (Module 1, Section 1) employ dependent sources. • A small control “voltage” can allow a BJTs 2.4 J. Schwartz g large change in “current”.
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Department of Electrical and Computer Engineering ECSE-330 Introduction to Electronics ipolar J nction Transistor (BJT) terminal device in which the voltage across 2 Bipolar Junction Transistor (BJT) 3 terminal device in which the voltage across 2 terminals controls the current flowing in/out of a 3 rd terminal: I C C V CB I E E V B I B V CE I B EB V EC B I E E V BE B I C V BC BJTs 2.5 J. Schwartz npn BJT C pnp BJT Department of Electrical and Computer Engineering ECSE-330 Introduction to Electronics JT Acti e Mode Terminal Eq ations BJT Active Mode Terminal Equations oltage across 2 terminals (base/emitter) controls Voltage across 2 terminals (base/emitter) controls current through a 3 rd (collector): pn np = T BE S C V v I i exp = T EB S C V v I i exp npn pnp Additional observation (applies to both transistor types) – total input current equals total output rrent: BJTs 2.6 J. Schwartz current: B C E i i i + = Department of Electrical and Computer Engineering ECSE-330 Introduction to Electronics he npn BJT Operational Modes The npn BJT Operational Modes EMITTER BASE COLLECTOR -E Junction -C Junction 4 Modes of operation – 4 different voltage bias possibilities B-E Junction B-C Junction Cutoff reverse reverse Active forward reverse BJTs 2.7 J. Schwartz Saturation forward forward Reverse Active reverse forward Department of Electrical and Computer Engineering ECSE-330 Introduction to Electronics cti e Mode: Base & Emitter Terminals Active Mode: Base & Emitter Terminals • Between the Base and the mitter, have a p- junction; like • When V BE is applied, a LARGE number of electrons Emitter, have a p n junction; like a diode • Across this junction in active
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ecse 330 - Department of Electrical and Computer...

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