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Common Base (CB). Input & Output Characteristics. Engr.Usman Ali Khan. Contents. CB, CE and CC CB Circuit CB Input Characteristics CB Output Characteristics. BJT Configurations. Common Base (CB) Common Emitter (CE) Common Collector (CC). Common Base (CB). E. C. Input. Output. B. - PowerPoint PPT Presentation
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Input & Output Characteristics
COMMON BASE (CB)
Engr.Usman Ali Khan
CONTENTS
1. CB, CE and CC
2. CB Circuit
3. CB Input Characteristics
4. CB Output Characteristics
BJT CONFIGURATIONS• Common Base (CB)
• Common Emitter (CE)
• Common Collector (CC)
COMMON BASE (CB)
Input Output
B
E C
Base is common both to input signal and output signal
COMMON EMITTER (CE)
Emitter is common both to input signal and output signal
Input
Output
E
C
B
COMMON COLLECTOR (CC)
Collector is common both to input signal and output signal
Input
Output
E
C
B
CB VOLTAGES AND CURRENTS
E
C
B
E
C
B
NPN PNP
IB
IE
IC
IB
IE
IC
VBE = 0.7 VEB = 0.7
VBE = -VEB
CB INPUT CHARACTERISTICS
B
E C
VBE
IE
VBC
IC
Input SideOutput Side
To observe the behavior of Base-Emitter junction when VBC is fixed
CB INPUT CHARACTERISTICS
VBE
IE
VCB = 0VVCB = 10V
VCB = 25V
0.7
CB OUTPUT CHARACTERISTICS
B
E C
VBE
IE
VBC
IC
Input SideOutput Side
To observe the behavior of Base-Collector junction when IE is fixed
CB OUTPUT CHARACTERISTICS
VBC
IC
-1 0 5 10
IE = 1mA
IE = 2mA
IE = 3mA
IE = 4mA
Saturation Region
Active Region
Junction Forward Biased Junction
Reverse Biased
Break down Region or Punch Through Region (Depletion Regions Overlap)
HOME WORK• Example: 4.2, 4.3
• End Problems: 4.6 4.7
Input & Output Characteristics
COMMON EMITTER (CE)
CONTENTS
1. β
2. CE Configuration
3. CE Input Characteristics
4. CE Output Characteristics
CE CONFIGURATION
InputE
C
B
Output
VCE
VCB
VBE
IB
IE
ICIE = IC + IB
VCE = VCB + VBE
VCE = VCB + 0.7
Input Current = IB
Input Voltage = VBE
Output Current = IC
Output Voltage = VCE
B
C
BC
CBOBC
CBOBC
CBOBC
BCECBOC
ECBOC
CBOEC
EINJC
CBOINJCC
I
I
II
III
III
III
IIIII
III
III
II
III
1
11
1
1
1
11
)(
)(
IC = 1mAIB = 10 µAβ =?
CE INPUT CHARACTERISTICS
VBE
IB
VCE = 20V
VCE = 10V
0.7
CE OUTPUT CHARACTERISTICS
VCE
IC
5 10 15 20
IB = 10 µA
IB = 20 µ A
IB = 30 µ A
IB = 40 µ A
Saturation Region
Active Region
Junction Reverse Biased
Break down Region or Punch Through Region (Depletion Regions Overlap)
HOME WORK• CC Characteristics
• Example: 4.4 4.6
• End Problems: 4.8 4.17
HOME TASK
• Make CC(Common Collector) Configuration and draw input output characteristics…