Input & Output Characteristics COMMON BASE (CB) Engr.Usman Ali Khan
Dec 18, 2015
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 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)
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 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)