Bipolar Junction Transistors (BJT) Tai-Cheng Lee Electrical Engineering/GIEE, NTU

Tai-Cheng LeeSpring 2006

Bipolar Junction Transistors(BJT)

Tai-Cheng LeeElectrical Engineering/GIEE, NTU

Why BJT

• Application

Device Structure

Operation in Active Mode-(1)

• Profile of minority carrier concentration

• Collector current

• Base current

• Emitter current

Equivalent Circuit in Active Mode

Structure of Actual Transistor

• Equivalent circuit model for reverse active

Ebers-Moll (EM) Model-(1)

• Universal model for BJT

Ebers-Moll (EM) Model-(2)

• iC –vCB characteristic of an npn transistor

Operation of PNP Transistors

Current-Voltage Characteristics-(1)

Current-Voltage Characteristics-(2)

• Graphical representation

• Thermal effect

Common-Base Characteristics-(1)

Early Effect

• Large-signal circuit model

Common-Emitter Characteristics –(1)

• Saturation voltage VCEsat

• Saturation resistance RCEsat

• Analyze by E-M Model

• Breakdown voltage

BJT Amplifier and Switch-(1)

• Large-Signal operation

• Graphical analysis

• Operation as a switch

BJT Circuits at DC-(1)

• Example 5.4

• Example 5.5

• Example 5.6

• Example 5.12

Biasing BJT -(1)

• Fixed VBE

Biasing BJT -(2)

• Classical discrete-circuit bias arrangement

Biasing BJT -(3)

• Two power supplies

• Collector-to-base feedback

Biasing BJT -(4)

• By a constant current source

Small-Signal Operation-(1)

• BJT Amplifier

• Collector current and transconductance

• Base current and the input resistance at base

• Emitter current and the input resistance at emitter

• Voltage gain

Small-Signal Models-(1)

• DC and AC signal separation

• Hybrid- model

• T model

• Ex 5.14

• Perform small-signal analysis on the circuit schematic

• Early Effect

Single-Stage BJT Amplifier-(1)

• Basic structure

Single-Stage BJT Amplifier-(2)

• Characterizing BJT Amplifier

• Refer Table 5.5

Common-Emitter Amplifier-(1)

• Small-signal model

Common-Emitter Amplifier-(2)

Common-Emitter Amplifier with Emitter Resistance-(1)

Common-Base Amplifier -(1)

Common-Base Amplifier -(2)

Common-Collector Amplifier -(1)

• CC amplifier is as known as emitter follower

• Resistance reflection rule to the base side

• Resistance reflection rule to the emitter side

• Thevenin equivalent circuit

• Summary and comparison

Bipolar Junction Transistors (BJT) Tai-Cheng Lee Electrical Engineering/GIEE, NTU

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