Lecture13-BJT+QualitativeAndPerformParam

# Lecture13-BJT+QualitativeAndPerformParam - ECE 3040...

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ECE 3040 - Dr. Ying Zhang Georgia Tech ECE 3040: Microelectronic Circuits Lecture 13 Reading : Pierret 10.1-10.6, 11.1

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ECE 3040 - Dr. Ying Zhang Georgia Tech Recapture Small Signal Analysis of Diodes Bias verse in V I I g Bias Forward in V I g General in V I I g v g I i T S S d T D d T S D d d d D D Re 0 + + = + = q kT V where e I T V V o T A = = 1 I D q kT V where e I T V V o T A = >> I 0 V D A 0 0 V A << T A V V e
ECE 3040 - Dr. Ying Zhang Georgia Tech Recapture Summary of the Small signal model of a diode R Series C Junction ( ) D t d Diffusion I f g C = τ () () () () () A m bi A Jo J m bi o S o S V junction Jo V f V V C C and V qb K m AK C C A = + = = + + = 2 1 2 1 0 1 2 ε T S D d d d D D V I I g where v g I i + = + = ( ) D I f = d d 1/g r

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ECE 3040 - Dr. Ying Zhang Georgia Tech 1.) Determine DC operating point and calculate small signal parameters 2.) Convert to the AC only model. •DC Voltage sources are shorts •DC Current sources are open circuits •Large capacitors are short circuits •Large inductors are open circuits Steps to Analyze a Diode Circuit with Small AC Signal: Recapture
ECE 3040 - Dr. Ying Zhang Georgia Tech ± Bipolar Junction Transistor (BJT) Fundamentals ± Electrostatics ± Basic Operation Agenda

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ECE 3040 - Dr. Ying Zhang Georgia Tech Bipolar Junction Transistor Fundamentals Voltage Nomenclature Standard V +- npn pnp Looks sort of like two diodes back to back
ECE 3040 - Dr. Ying Zhang 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

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ECE 3040 - Dr. Ying Zhang Georgia Tech Bipolar Junction Transistor Fundamentals 0 = + + + = CE BC EB C B E V V V I I I
ECE 3040 - Dr. Ying Zhang

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Lecture13-BJT+QualitativeAndPerformParam - ECE 3040...

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