36.voltage divider bias
TRANSCRIPT
BJTVoltage Divider Biasing
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Objectives At the end of the module the student
would be able to explain Study Voltage Divider Bias
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Voltage Divider Bias Circuit Provides good Q-point stability
with a single polarity supply voltage
1st step: Locate capacitors and replace them with an open circuit
2nd step: Simplified circuit using Thevenin Theorem
3rd step: Locate 2 main loops which; BE loop CE loop
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Voltage Divider Bias Circuit 1st step: Locate capacitors and replace them with
an open circuit
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Voltage Divider Bias Circuit■2nd step: : Simplified circuit using Thevenin
Theorem
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Thevenin Theorem; 21
2121 // RR
RRRRRTH
CCTH VRR
RV21
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From Thevenin Theorem;
Voltage Divider Bias Circuit■3rd step: : Locate 2 main loops.
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2
BE Loop CE Loop
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Voltage Divider Bias Circuit BE Loop Analysis
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1Recall;Substitute for IE
0 EEBETHBTH RIVRIV
ERTH
BETHB
EBBETHBTH
RRVVI
RIVRIV
)1(
0)1(
BE II )1(
Voltage Divider Bias Circuit CE Loop Analysis
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2Assume;
Therefore;CE II
0 EECECCCC RIVRIV
)( ECCCCCE RRIVV
Build the circuit as shown below and find out the following parameters IC , IB , VB, VE and VC
Voltage Divider Bias Circuit9
Voltage Divider Bias Circuit10
Simulation and Results Run DC analysis with Default Settings Observe the output on voltmeters and ammeters
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Access it Online12
You can access this experiment from the link below
http://www.docircuits.com/public-circuit/380/bjt-voltage-divider-bias