chapter 06 bjtamplifiers 1
TRANSCRIPT
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Microelectronics Circuit Analysis and DesignCircuit Analysis and Design
Donald A. Neamen
Chapter 6Chapter 6
Basic BJT Amplifiers
Neamen Microelectronics, 4e Chapter 6-1McGraw-Hill
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In this chapter, we will:p ,
Understand the concept of an analog signal and the principle of a linear amplifier.e p p e o a ea a p e Investigate how a transistor circuit can amplify a
small, time-varying input signal. Discuss and compare the three basic transistor Discuss and compare the three basic transistor
amplifier configurations.Analyze the common-emitter amplifier.y p Understand the ac load line & determine the
maximum symmetrical swing of the output.Analyze the emitter follower amplifierAnalyze the emitter-follower amplifier.Analyze the common-base amplifier.
Analyze multitransistor or multistage amplifiers. Analyze multitransistor or multistage amplifiers. circuit. Understand the concept of signal power
gain in an amplifier
Neamen Microelectronics, 4e Chapter 6-2McGraw-Hill
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Common Emitter Common Emitter with Time-Varying Input
Neamen Microelectronics, 4e Chapter 6-3McGraw-Hill
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IB Versus VBEIB Versus VBECharacteristic
be iIvIi )1( bBT
beBQB iI
VIi )1(
Neamen Microelectronics, 4e Chapter 6-4McGraw-Hill
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ac Equivalent Circuit qfor Common Emitter
Neamen Microelectronics, 4e Chapter 6-5McGraw-Hill
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Small-Signal Hybrid Model for npn BJT Small Signal Hybrid Model for npn BJT
VI
gT
CQm
I
Vr T
T
rg
I
m
CQ
gm
Phasor signals are shown in parentheses.
Neamen Microelectronics, 4e Chapter 6-6McGraw-Hill
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Small-Signal Equivalent Circuit Using Small Signal Equivalent Circuit Using Common-Emitter Current Gain
Neamen Microelectronics, 4e Chapter 6-7McGraw-Hill
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S ll Si l E i l t Ci it f Small-Signal Equivalent Circuit for npn Common Emitter circuit
))((B
Cmv RrrRgA
Neamen Microelectronics, 4e Chapter 6-8McGraw-Hill
B
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Problem-Solving Technique: Problem Solving Technique: BJT AC Analysis
1. Analyze circuit with only dc sources to find Q pointpoint.
2. Replace each element in circuit with small-signal model including the hybrid model for signal model, including the hybrid model for the transistor.
3 Analyze the small signal equivalent circuit 3. Analyze the small-signal equivalent circuit after setting dc source components to zero.
Neamen Microelectronics, 4e Chapter 6-9McGraw-Hill
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Transformation of ElementsElement DC Model AC Model
Resistor R R
Capacitor Open C
Inductor Short L
Diode +V, rf – rd = VT/ID, f d T/ D
Independent Constant Voltage Source
+ VS - Short
Independent Constant Current Source
IS Open
Neamen Microelectronics, 4e Chapter 6-10McGraw-Hill
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Hybrid Model for npn with Early EffectHybrid Model for npn with Early Effect
Ao I
Vr CQI
Neamen Microelectronics, 4e Chapter 6-11McGraw-Hill
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Hybrid p Model for pnp with Early EffectHybrid p Model for pnp with Early Effect
Neamen Microelectronics, 4e Chapter 6-12McGraw-Hill
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Expanded Hybrid Model for npnExpanded Hybrid Model for npn
Neamen Microelectronics, 4e Chapter 6-13McGraw-Hill
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h-Parameter Model for npnh Parameter Model for npn
bie
h
rrrh re rrh
feh
ooe rr
h 11
Neamen Microelectronics, 4e Chapter 6-14McGraw-Hill
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T-Model of an npn BJTT Model of an npn BJT
Neamen Microelectronics, 4e Chapter 6-15McGraw-Hill
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4 Equivalent 2-port Networks4 Equivalent 2 port Networks
Voltage Amplifier
Current Amplifier
Neamen Microelectronics, 4e Chapter 6-16McGraw-Hill
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4 Equivalent 2-port Networks4 Equivalent 2 port Networks
Transconductance Amplifier
Transresistance Amplifier
Neamen Microelectronics, 4e Chapter 6-17McGraw-Hill
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Common Emitter with Voltage-Divider gBias and a Coupling Capacitor
Neamen Microelectronics, 4e Chapter 6-18McGraw-Hill
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Small-Signal Equivalent Circuit –Small Signal Equivalent Circuit Coupling Capacitor Assumed a Short
Neamen Microelectronics, 4e Chapter 6-19McGraw-Hill
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npn Common Emitter pwith Emitter Resistor
Neamen Microelectronics, 4e Chapter 6-20McGraw-Hill
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Small-Signal Equivalent Circuit:Small Signal Equivalent Circuit:Common Emitter with RE
)( )1(
21 ibi
Eib
RRRRRrR
)()1( Si
i
E
Cv RR
RRr
RA
Neamen Microelectronics, 4e Chapter 6-21McGraw-Hill
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RE and Emitter Bypass CapacitorRE and Emitter Bypass Capacitor
Neamen Microelectronics, 4e Chapter 6-22McGraw-Hill
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Current Source Biasing and Current Source Biasing and Nonlinear Load
Neamen Microelectronics, 4e Chapter 6-23McGraw-Hill
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Small-Signal Equivalent Circuit with Small Signal Equivalent Circuit with Current Biasing and Nonlinear Load
)( comv rrgA
Neamen Microelectronics, 4e Chapter 6-24McGraw-Hill
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dc AND ac Load Lines: dc AND ac Load Lines: RE and Emitter Bypass Capacitor
Neamen Microelectronics, 4e Chapter 6-25McGraw-Hill
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Problem-Solving Technique:g qMaximum Symmetrical Swing
1. Write dc load line equation that relates ICQ and VCEQ.
2 W it l d li ti th t l t i 2. Write ac load line equations that relates ic and vce
3 In general i = I I (min) where I (min) 3. In general, ic = ICQ – IC(min), where IC(min) is zero or other minimum collector current.
4 In general v = V – V (min) where 4. In general, vce = VCEQ VCE(min), where VCE(min) is some specified minimum collector-emitter voltage.g
5. Combine above 4 equations to find optimum ICQ and VCEQ.
Neamen Microelectronics, 4e Chapter 6-26McGraw-Hill
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Common-Collector Common Collector or Emitter-Follower Amplifier
Neamen Microelectronics, 4e Chapter 6-27McGraw-Hill
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Small-Signal Equivalent Circuit:Small Signal Equivalent Circuit:Emitter Follower
))(1(
21 ibi
Eoib
RRRR
RrrR
)())(1(
))(1(
Si
i
Eo
Eov
ib
RRR
RrrRr
A
Neamen Microelectronics, 4e Chapter 6-28McGraw-Hill
))(( SiEo
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Output Resistance:Output Resistance:Emitter Follower
oEo rRrR oEo 1
Neamen Microelectronics, 4e Chapter 6-29McGraw-Hill
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Common-Base AmplifierCommon Base Amplifier
Neamen Microelectronics, 4e Chapter 6-30McGraw-Hill
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Small-Signal Equivalent Circuit:Small Signal Equivalent Circuit:Common Base
)( LCmv RRgA
]1
)[( ELC
Cmi Rr
RRRgA
Neamen Microelectronics, 4e Chapter 6-31McGraw-Hill
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Input Resistance:Input Resistance:Common Base
R /(1 )Rie = r/(1+)
Neamen Microelectronics, 4e Chapter 6-32McGraw-Hill
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Output Resistance:Output Resistance:Common Base
R = RRO = RC
Neamen Microelectronics, 4e Chapter 6-33McGraw-Hill
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Common Emitter Cascade AmplifierCommon Emitter Cascade Amplifier
Neamen Microelectronics, 4e Chapter 6-34McGraw-Hill
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Small-Signal Equivalent Circuit:Small Signal Equivalent Circuit:Cascade Amplifier
Neamen Microelectronics, 4e Chapter 6-35McGraw-Hill
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Darlington PairDarlington Pair
21iA
Neamen Microelectronics, 4e Chapter 6-36McGraw-Hill
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Cascode AmplifierCascode Amplifier
Neamen Microelectronics, 4e Chapter 6-37McGraw-Hill
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Small-Signal Equivalent Circuit:Small Signal Equivalent Circuit:Cascode Amplifier
)(1 LCmv RRgA
Neamen Microelectronics, 4e Chapter 6-38McGraw-Hill