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BJT – Analysis of
Bias
Yong Heui Cho @ Mokwon University
Some of slides are referred to:
[1] A. S. Sedra & K. C. Smith, Microelectronic Circuits.
2
Electronic Circuits
8. BJT – Operational Principle
9. BJT – Model
10. BJT – Analysis of Bias
11. Analysis of CE Amplifier
3
CE Amplifier
• CE (Common Emitter)
• Input: Base, Output: Collector
• Common: Emitter
4
CB Amplifier
• CB (Common Base)
• Input: Emitter, Output: Collector
• Common: Base
5
CC Amplifier
• CC (Common Collector)
• Emitter Follower
• Input: Base, Output: Emitter
• Common: Collector
6
Comparison
Type CE CB CC
input Base Emitter Base
output Collector Collector Emitter
common Emitter Base Collector
V gain large large none
I gain large none large
application
first stage
amplifier
high frequency
amplifier
buffer
7
Bias Point
• Quiescent point
• Active mode
8
CE Amplifier
• 4 R and 1 TR
9
Active Condition
• Collector Current (IC) = about mA
• CE Voltage (VCE) = VCC/2
10
Analysis of Bias (I)
• Thevenin equivalent circuit
CC
BB
B
BB V
RR
R
V
21
2



VBB
RB
11
Analysis of Bias (II)
• B-E loop: collector current (IC)
VBB
RB
VCC
RC
RE
  BEBBE
EEBEBBBB
IRRV
RIVRIV
)1( 



BCBE IIII )1(  
EB
BEBB
B
RR
VV
I
)1( 



E
BEBB
EB
BEBB
C
R
VV
RR
VV
I





)1(
)(


12
Analysis of Bias (III)
• C-E loop: CE voltage (VCE)
VBB
RB
VCC
RC
RE
BCBE IIII )1(  
EECECCCC RIVRIV 
)( ECCCC
EECCCCCE
RRIV
RIRIVV



13
Selection of R
 kRR BB 10, 21
BE RR 
LC RR 




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BJT - Analysis of Bias

  • 1. BJT – Analysis of Bias Yong Heui Cho @ Mokwon University Some of slides are referred to: [1] A. S. Sedra & K. C. Smith, Microelectronic Circuits.
  • 2. 2 Electronic Circuits 8. BJT – Operational Principle 9. BJT – Model 10. BJT – Analysis of Bias 11. Analysis of CE Amplifier
  • 3. 3 CE Amplifier • CE (Common Emitter) • Input: Base, Output: Collector • Common: Emitter
  • 4. 4 CB Amplifier • CB (Common Base) • Input: Emitter, Output: Collector • Common: Base
  • 5. 5 CC Amplifier • CC (Common Collector) • Emitter Follower • Input: Base, Output: Emitter • Common: Collector
  • 6. 6 Comparison Type CE CB CC input Base Emitter Base output Collector Collector Emitter common Emitter Base Collector V gain large large none I gain large none large application first stage amplifier high frequency amplifier buffer
  • 7. 7 Bias Point • Quiescent point • Active mode
  • 8. 8 CE Amplifier • 4 R and 1 TR
  • 9. 9 Active Condition • Collector Current (IC) = about mA • CE Voltage (VCE) = VCC/2
  • 10. 10 Analysis of Bias (I) • Thevenin equivalent circuit CC BB B BB V RR R V 21 2    VBB RB
  • 11. 11 Analysis of Bias (II) • B-E loop: collector current (IC) VBB RB VCC RC RE   BEBBE EEBEBBBB IRRV RIVRIV )1(     BCBE IIII )1(   EB BEBB B RR VV I )1(     E BEBB EB BEBB C R VV RR VV I      )1( )(  
  • 12. 12 Analysis of Bias (III) • C-E loop: CE voltage (VCE) VBB RB VCC RC RE BCBE IIII )1(   EECECCCC RIVRIV  )( ECCCC EECCCCCE RRIV RIRIVV   
  • 13. 13 Selection of R  kRR BB 10, 21 BE RR  LC RR    