bjt biasing
DESCRIPTION
BJT AnalysisTRANSCRIPT
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BJT DC BIASING
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For the BJT to be biased in its linear or active operating region, the following must be true:• The base-emitter
junction must be forward-biased
• The base-collector junction must be reverse-biased
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Operation in cut-off, saturation and linear regions of the BJT characteristics are provides as follows:
1. Linear-region operation: Base-emitter junction forward biased Base-collector junction reverse-biased
2. Cutoff-region operation: Base-emitter junction reverse biased
3. Saturation-region operation Base-emitter junction forward biased Base-collector junction forward biased
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FIXED-BIAS CIRCUIT
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FORMULAS INVOLVEDBase-emitter Base-collector
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EXAMPLE 1
Determine the following for the fixed-bias configuration.
a) IBQ and ICQ
b) VCEQ
c) VB and VC
d) VBC
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EMITTER-STABILIZED BIAS CIRCUIT
Contains an emitter resistor to improve stability level over that of the fixed-bias configuration.
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BASE EMITTER LOOP
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COLLECTOR-EMITTER LOOP
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EXAMPLE 2For the emitter bias network, determine:
a) IB
b) IC
c) VCE
d) VC
e) VE
f) VB
g) VBC
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VOLTAGE-DIVIDER BIAS
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Determine the dc bias voltage VCE and the current IC.
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COLLECTOR FEEDBACK
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BASE-EMITTER LOOP
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COLLECTOR-EMITTER LOOP
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EXAMPLE 4
Determine Ic and VCE
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EMITTER-FOLLOWER CONFIGURATION
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EXAMPLE 5
Determine IE and VCE
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COMMON-BASE CONFIGURATION
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EXAMPLE 6Determine:
a. IE
b. IB
c. VCE
d. VCB